Use #1.
FIREWOOD- If you are ever out of coals or wood to burn on the grill, simply grab a skateboard and there ya go. The wood burns steady and even, and the grip tape adds a nice flavor to hamburgers.
Use #2.
TRASH- If you ever find a skateboard out in the street, find the nearest garbage can and throw it away.
Use #3a.
SHOVEL TO DIG A HOLE- Grab your old skateboard and dig a hole in the backyard with the tail.
Use #3b.
SHOVEL TO BURY- Next place the board in the hole and bury it.
Use #4.
MOVE HEAVY OBJECTS: A skateboard is great for moving heavy objects.
Use #5.
POOPER SCOOPER: When your dog takes a dump in the front yard your skateboard tail is a perfect pooper scooper.
Remember this is just comedy. Everyone that rolls (skateboards, bmx, rollerblades) are good humans. Be cool with each other and work together to get more skateparks built.