Brad Pitt is used to pulling prank jokes on George Clooney and Matt Damon while they filmed the Ocean's series. So it just makes sense that he continued the fun on the set of The Assassination of Jessie James with Casey Affleck. Right before a scene would begin, Brad would tip his cigar's ashes on his co-star's hat or just slap him.

"Right before they say action, Brad will put ash on you or light your pants on fire or just slap you. That's a good way to start the scene as far as he's concerned. Brad's a fun man. He's really fun to work with. It's strange how he can stay in character and do his thing, but also put ash in your hat right before they say action."