Brad Pitt has warned pal Ashton Kutcher against playing practical jokes on Hollywood's most notorious prankster, George Clooney - because the movie hunk will make his life a misery.

Pitt, who recently interviewed Kutcher for a US magazine, took the opportunity to advise his friend not to go after his "Ocean's Eleven" partner for Kutcher's prank show "Punk'd".

"I remember two years ago you were after Clooney. I would tell you as your friend: 'Don't do it. Don't ever go near it. He'll kill you and everything you love.' I know it's tempting, but don't do it," Pitt said.

Pitt was on the receiving end of one of Clooney's top pranks. On the set of "Ocean's Twelve", he told crew members that Clooney insists on staying in character and wanted to be called Danny Ocean throughout the shoot.

In revenge, Clooney made Pitt drive through rush hour Hollywood traffic with a bumper sticker on his back reading 'Small Penis Onboard'.