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Best Celebrity Pranks

3. George Clooney vs. Brad Pitt

When these two were filming Ocean's Twelve back in the day, Brad Pitt put out a memo in Italian claiming George Clooney only wanted the film crew to call him Mr. Ocean, and to please not looking him in the eyes. Clooney retaliated by putting a bumper sticker on Pitt's car reading, "Small Penis on Board."