During the filming of Ocean's 11, Brad Pitt started a prank battle with George Clooney. The first prank consisted of a letter sent by Pitt on "behalf" of Clooney advising the Italian film crew to basically steer clear of Clooney and to only address him as "Daniel" or "Mr. Ocean." There was no mention on whether or not Clooney actually answered to these names. During the two-week stretch that the prank lasted, crew members treated Clooney with an unprecedented amount of isolated respect.
Although Pitt prophesied that there would eventually be a retaliatory response, Clooney has yet to enact his revenge, but did mention Pitt has something coming to him. Brad acknowledged this and comments that he has a second prank already planned.
Remember he who has the last laugh has a car that isn't cellophaned... or maybe sunglasses outside of Jell-o. Brad needs to be wary, as Clooney could easily recruit Pitt's children as part of a masterful plan more clever than the heists seen in any of the Ocean films.