George Clooney Pulls Embarrassing Prank On Brad Pitt

This was too funny NOT to include here:
NEW YORK -- Brad Pitt might think twice about punking George Clooney again.
Pitt had the nerve to pull a prank on Clooney while they were filming "Ocean's Twelve" -- even though Clooney's the king of the pranksters. Matt Damon told Cosmo that Clooney got Pitt back by slapping a bumper sticker on his car that read "Small Penis Onboard."
Damon said Pitt drove through rush hour in Los Angeles without knowing why people were looking at him and waving.