George Clooney is not above a good prank every now and then.

The silver screen king appeared on Jimmy Kimmel Live! on Tuesday (September 17), and got candid about a prank that he's played on "every actor I know," inspired by a gift from the famed talk show host.

"Every actor I know I've sent a letter from Bill Clinton. I try to find their worst film and I tell them, 'So I was on the plane and.'"

It all started when Kimmel gifted Clooney fake Bill Clinton stationary years ago, propelling a joke that lives on to this day. The Ocean's Eleven alum detailed immense success in pranking longtime friend Tom Cruise with a letter pretending to be Brad Pitt.

"The Brad Pitt one was brutal. I sent it to Don Cheadle. I sent it to Tom Cruise, saying they want to do [ an interview with the Vampire 2], but this time Brad wants to play Lestat. And I sent it to Meryl Streep with a box of CDs for dialect and I said, 'This guy helped me with my accent in Troyand I think it could really help you.'"

Kimmel chimed in, revealing how the prank spiraled after Cruise took the bait.

"Brad this afternoon said that Tom called him and said 'Yeah, it's cool, you can play Lestat, that's fine, I'm okay with that,' and he was like, 'What are you talking about?'"

The joke has been going on for so long, that friends and co-stars have begun to suspect that Clooney is behind any fishy letter they receive, but that hasn't stopped the icon yet. In fact, he plans to keep the prank in his arsenal incase someone tries to get him back.

"I will say this — once you've done a really dastardly, long-running thing, it's like having nuclear weapons. Everyone's so terrified that you can — you know this — somebody called Richard Kind and they wanted to do Punk'd or one of those dumba-- shows, and they wanted to like punk me and they called all my friends and they were like 'No! He could put a dead body in my apartment.'"

Watch the full Jimmy Kimmel Live! episode featuring Clooney and the tale of his legendary prank below.

Pet of the Week