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It's hard to believe Robert De Niro did a movie with 50 Cent but it did happen. It's just one example of a respected, serious actor taking a paycheck to appear in a virtual B movie alongside lesser talent. Our list also includes A-listers like Megan Fox and Bill Murray, who appear together in a movie you'll only find on at 4 AM on Cinemax. Click ahead to see more stars in movies you won't believe.