8 Reasons We Never Want to Be Friends With George Clooney, Matt Damon, or Brad Pitt

"I've done some terrible things to Brad Pitt," George joked during an appearance on The Graham Norton Show in 2015, before disclosing what he did to Brad to kick off their prank war. While filming 2001's Ocean's Eleven, he secretly put a bumper sticker on the back of Brad's car in the shape of a pot leaf with the words "F*ck Cops" in hopes it would get him pulled over. Lo and behold it did, and Brad declared war.