501. Montana mountain goats will butt heads so hard their hooves fall off.
502. The Beatles song "Dear Prudence" was written about Mia Farrow's sister, Prudence, when she wouldn't come out and play with Mia and the Beatles at a religious retreat in India.
503. Cranberries are sorted for ripeness by bouncing them; a fully ripened cranberry can be dribbled like a basketball.
504. The giant squid has the largest eyes in the world.
505. St. Paul, Minnesota was originally called Pigs Eye after a man who ran a saloon there.
506. The numbers '172' can be found on the back of the U.S. $5 dollar bill in the bushes at the base of the Lincoln Memorial.
507. Moon was Buzz Aldrin's mother's maiden name. (Buzz Aldrin was the second man on the moon in 1969.)
508. Who's that playing the piano on the "Mad About You" theme? It's Paul Reiser himself. And Greg Evigan sang the "My Two Dads" theme. Kelsey Grammar sings and plays the piano for the theme song of Fraiser. Alan Thicke, the father in the TV show "Growing Pains" wrote the theme songs for "The Facts of Life" and "Diff'rent Strokes".
509. In 1963, baseball pitcher Gaylord Perry remarked, "They'll put a man on the moon before I hit a home run." On July 20, 1969, a few hours after Neil Armstrong set foot on the moon, Gaylord Perry hit his first, and only, home run.
510. The Grateful Dead were once called The Warlocks.
511. Gilligan of Gilligan's Island had a first name that was only used once, on the never-aired pilot show. His first name was Willy. The Skipper's real name is Jonas Grumby. It was mentioned once in the first episode on their radio's newscast about the wreck. The Professor's real name was Roy Hinkley, Mary Ann's last name was Summers and Mrs. Howell's maiden name was Wentworth.
512. Reindeer milk has more fat than cow milk.
513. The "L.L." in L.L. Bean stands for Leon Leonwood.
514. The original fifty cent piece in Australian decimal currency had around $2.00 worth of silver in it before it was replaced with a less expensive twelve sided coin.
515. The letters KGB stand for Komitet Gosudarstvennoy Bezopasnosti.
516. Alexander the Great was an epileptic.
517. The lead singer of The Knack, famous for "My Sharona," and Jack Kevorkian's lead defense attorney are brothers, Doug & Jeffrey Feiger.
518. Elton John's real name is Reginald Dwight. Elton comes from Elton Dean, a Bluesology sax player. John comes from Long John Baldry, founder of Blues Inc. They were the first electric white blues band ever seen in England-1961.
519. Horses cannot vomit. Neither can rabbits.
520. S.O.S. doesn't stand for "Save Our Ship" or "Save Our Souls" -- It was just chosen by an 1908 international conference on Morse Code because the letters S and O were easy to remember and just about anyone could key it and read it, S = dot dot dot, O = dash dash dash.
521. Pocahontas appeared on the back of the $20 bill in 1875.
522. When a female horse and male donkey mate, the offspring is called a mule, but when a male horse and female donkey mate, the offspring is called a hinny.
523. A donkey will sink in quicksand but a mule won't.
524. Hugh "Ward Cleaver" Beaumont was an ordained minister.
525. The Old English word for "sneeze" is "fneosan."
526. Woodpecker scalps, porpoise teeth and giraffe tails have all been used as money.
527. The Los Angeles Rams were the first U.S. football team to introduce emblems on their helmets.
528. The average garden variety caterpillar has 248 muscles in its head.
529. Dartboards are made out of horsehairs.
530. One of the many Tarzans, Karmuela Searlel, was mauled to death on the set by a raging elephant.
531. Slinkys were invented by an airplane mechanic; he was playing with engine parts and realized the possible secondary use of one of the springs.
532. Octopi have gardens.
533. Ever think you're hearing something in a song, but they're really singing something else? The word for mis-heard lyrics is 'mondegreen,' and it comes from a folk song in the '50's. The singer was actually singing "They slew the Earl of Morray and laid him on the green," but this came off sounding like 'They slew the Earl of Morray and Lady Mondegreen.'"
534. Napoleon constructed his battle plans in a sandbox.
535. 'Strengths' is the longest word in the English language with just one vowel.
536. One of the longest English words that can be typed using the top row of a typewriter (allowing multiple uses of letters) is 'typewriter.'
537. When a giraffe's baby is born it falls from a height of six feet, normally without being hurt.
538. Virgina Woolf wrote all her books standing.
539. The pitches that Babe Ruth hit for his last-ever homerun and that Joe DiMaggio hit for his first-ever homerun where thrown by the same man.
540. To "testify" was based on men in the Roman court swearing to a statement made by swearing on their testicles.
541. During conscription for WWII, there were nine documented cases of men with three testicles.
542. Both Hitler and Napoleon were missing one testicle.
543. Stalin was only five feet, four inches tall.
544. Stalin's left foot had webbed toes, and his left arm is noticeably shorter than his right.
545. Swans are the only birds with penises.
546. Some carnivores, rodents, bats and insectivores have a penis bone, called a baculum.
547. A barnacle has the largest penis of any other animal in the world in relation to its size.
548. Tomb robbers believed that knocking Egyptian sarcophagi's noses off would and therefore forestall curses.
549. The allele for six fingers and toes is dominant in humans.
550. The face of a penny can hold about thirty drops of water.
551. Medieval knights put sharkskin on their sword handles to give them a more secure grip; they would dig the sharp scales into their palms.
552. Orcas (killer whales) kill sharks by torpedoing up into the shark's stomach from underneath, causing the shark to explode.
553. The four gas giants, Jupiter, Saturn, Uranus and Neptune, all have rings.
554. Wayne's World was filmed in two weeks.
555. If you feed a seagull Alka-Seltzer, its stomach will explode.
556. The raised reflective dots in the middle of highways are called Botts dots.
557. Boris Karloff is the narrator of the seasonal television special "How the Grinch Stole Christmas."
558. The 80s song "Rosanna" from the Eighties was written about Rosanna Arquette, the actress.
559. Warren Beatty and Shirley MacLaine are brother and sister.
560. Starfish don't have brains.
561. Shrimps' hearts are in their heads.
562. Hotel elevators usually have mirrors next to them because vanity and hotel proprietors expect that your attention will be diverted as you admire your own image. The longer you look at the pretty reflection in the mirror, the less time you'll spend thinking about the wait caused by the lack of elevators.
563. Which word came first, "icebox" or "refrigerator?" Refrigerators needed electricity; before homes were electrified, people preserved food in iceboxes. So icebox must have come first. But it didn't. What was eventually called the icebox was invented in Maryland in 1803. It was at first called a "refrigerator" ("to cool" in Latin is "frigerare"). Only later did it become an "icebox." Electric refrigerators date from 1916, and were common by the 1930s. So the new appliance actually thawed out an old word.
564. Bumfuzzle: It means to confuse, and may have come from the earlier "dumfoozle."
565. Dunkadoo: A kind of Bittern (bird) found off the coast of New Jersey. The word sounds like the bird's call.
566. Googol: The number ten to the one-hundredth power. Googolplex is one followed by a googol of zeroes.
567. Oogamus: Sexual reproduction in which a small, fast sperm mates with a big egg.
568. Snollygoster: Someone who's sharp but with no scruples.
569. "I Love Lucy" debuted on CBS on October 15, 1951. Since then, Lucille Ball had starred in a similar show on radio, "My Favorite Husband."
570. CBS executives initially thought that Desi Arnaz, Lucy Ball's *real life* spouse, wouldn't be believable as her husband on the show.
571. "I Love Lucy" was the first major network program filmed before a live audience.
572. Lucy Ball was on the cover of the first issue of TV Guide.
573. The first U.S. coins were made of silver from Martha Washington's silver service. Mrs. Washington was very proud to help out the new country, but refused to invite anyone from the Treasury Department to future dinner parties at her house.
574. Some insects, after having their heads removed, can live up to a year.
575. Holding your breath to stop hiccups works because the build-up of carbon dioxide in your lungs can stop your diaphragm from contracting, the cause of your discomfort.
576. The White House was originally gray. After the war of 1812, it was rebuilt and painted. In 1902 it was remodeled and acquired the name "White House." It wasn't until this current administration (1998) that the little red light was added out front.
577. It isn't illegal to send a chain letter. It is, however, illegal to threaten lives or solicit money, two things chain letters were noted for.
578. Bulletproof glass really isn't. Repetitive attacks will eventually penetrate the glass, but it does offer a little time to get away.
579. United States dimes, quarters, and half dollars have notches all around their edges, but pennies and nickels have no notches. This heralds back to the day when the value of a coin was determined by the amount of silver or gold it contained. The US mint incorporated the notches as a way of discouraging people from shaving off small amounts of the precious metals from the coins. Less valuable coins have always contained only cheaper metals, and so their smooth edges were allowed to remain. Although coins today no longer contain silver, the notches have been kept as part of their design, and are useful for recognition by the visually impaired.
580. Buckingham Palace guards wear those big furry hats, made from Canadian bearskin, as a prize. They were originally worn by Napoleon's Imperial Guard to make them seem taller and more intimidating to enemy troops. When the British sent Napoleon packing at Waterloo in 1815, they adopted the hats for their own elite military units to celebrate the victory.
581. Recently, animal lovers demanded a switch to fake fur on the Buckingham Palace guard hats to save the bears. But a government spokesperson countered that synthetic fur, when rained on, would make the guards look like they were "having a bad hair day."
582. Most extras assembled for a single scene: 300,000, for the two-minute funeral scene in Gandhi.
583. Most insects used in a film: 22 million bees in The Swarm.
584. Most kisses in a movie: 127, by Lionel Barrymore in Don Juan (1926). The recipients were Mary Astor and Estelle Taylor. This was also the first feature film with a musical soundtrack (but no dialogue).
585. A 50 pound bag of popcorn kernels costs the theater approximately $7.50. One pound of popcorn makes a whopping 64 cups of popped popcorn.
586. Blackbird, chief of the Omaha Indian Tribe, was buried perched upon his favorite horse.
587. In 1932, the town of Tenino, Washington solved the cash flow problem by issuing wooden money.
588. The record for a person being covered by bees--and living to tell about it--is held by bee-keeper Jed Shaner, who had 80 pounds of them on his body. He says that his feat was sponsored by "a police group that helps teens at risk."
589. Reading right to left started when the ancient Greeks adopted a style known as "boustrophedon," a reference to turning the way an ox turns a plow. This super efficient style went from left to right and right to left on alternate lines, saving the eyeballs the trip back to the right side to start a new line. Around 500 BC, the Greeks began to write exclusively from left to right. The reasons for the change are uncertain, but may have to do with a new-split reed pen that was easier to move in that direction.
590. In the ancient Mediterranean world there was no soap. Instead they used olive oil.
591. The giant squid continues to grow through its entire life, some of them have gone on to reach lengths of 50 feet.
592. Scientists have found that chocolate has a chemical that helps counteract depression.
593. Only male crickets chirp.
594. According to the US Government people have tried nearly 28,000 different ways to lose weight.
595. During the reign of Catherine I of Russia, the rules for parties stipulated that no man was to get drunk before 9 o'clock and ladies weren't to get drunk at any hour.
596. Picasso's full name was: Pablo Diego Jose Francisco de Paula Juan Nepomuceno de los Remedios Cipriano de la Santisma Trinidad Ruiz y Picasso.
597. Membership in the rose family (Rosaceae) is not limited to roses. It also includes almonds, apples, apricots, blackberries, cherries, nectarines, peaches, pears, plums, raspberries and strawberries.
598. In Britain's House of Commons, the government and opposition sides of the House are separated by two red lines. The distance between the lines is two swords' lengths, a reminder of just how seriously the Brits used to take their politics.
599. The British once went to war over a sailor's ear. It happened in 1739, when Britain launched hostilities against Spain because a Spanish officer had supposedly sliced off the ear of a ship's captain named Robert Jenkins.
600. The oyster is usually ambisexual. Through its life it will change from male to female and back again numerous times.

Where I learn some of this crazy stuff:
The Learning Kingdom
MailBits.com
Win Ben Stein's Money
Accord Publishing's 1999 Nose It All Calendar
Hot Topic pay stubs
E-mails which worm their way into my inbox
Tyler Whitney's Completely Random Home Page
UselessKnowledge.com
The Danny Baker Show
PhiLL's Site Of Useless Information
Buy-ology - TLC
Spam page
Silly Putty page
Other interesting things too long for the TTUF's