The real origin was revealed in a "Buffy the Vampire Slayer" DVD feature, and it involves Xander.
John vs. Paul vs. George vs. — heh — Ringo. We chose our five favorite of each, you tell us the right pick.
This man is a genius.
It involves your puppy and/or direwolf.
Suddenly, your Great Aunt Helga doesn't look so terrifying, does she?
All hail the mighty pumpkin.