People QuizPop Quiz: Hollywood's Biggest Pranksters

Spend your April Fools' Day with Ashton, George and the rest of Hollywood's mischief-makers. By Jonathan Stern

CREDIT: Splash News Online

Published: Tuesday April 01, 2008 06:00 AM EDT

During the filming of Ocean's Twelve, notorious prankster George Clooney put unflattering bumper stickers on pal Brad Pitt's car. What did they say?

"Honk If You're Horny"
"Small Penis On Board"
"My Kid Beat Up Your Honor Student"
"Babies On Board. So Many Babies."