Mine is probably a tie between my Halloween costume (GIANT KETCHUP BOTTLE!!!) back in fourth grade and about a week and a half ago when some friends and I filled a friend's car with 8000 styrofoam cups.
Pics (OR IT DIDN"T HAPPEN):


video from the styrofoam cups incident: Rated R for language (nothing excessive, but a few F-bombs) and chronic stupidness

