Dumb and DumberEvery year on the night before Halloween, prank-playing diehards of all ages (well, no one over 16, we hope) take to the streets for what is lovingly referred to by those who partake in its festivities as Mischief Night. And what's Mischief Night, or any night for that matter, without a little light egging, some cleverly rigged buckets of blood, the classic "flaming bag of poop" and -- as perfected in 'Dumb and Dumber' -- the always funny Ex-Lax in your pal's milkshake? So in honor of the eve of All Hallow's Eve, we present, for your viewing and revenge-plotting pleasure, some of cinema's most memorable, most childish and most tasteless prank scenes.

(Warning: Some adult -- and poop-filled -- content after the jump.)