Ghosts are dead people glamourized in such movies as "Ghost", "Poltergiest", "The Sixth Sense", and "Always". ALhtough the ghosts in these movies seem extravagant and high class, do not be fooled. Ghosts are just regular people, but dead.
When approaching a ghost, do not ask for an autograph. They are no longer concrete, tangible beings, so they can't hold a pen. Also, do not look them in the eyes. Doing so would result in looking straight through them because they are usualy translucent.
In conclusion, ghosts are people just like us. Be kind to them and they won't turn on your gas stove when you leave the house.