10. 'Ace Ventura: When Nature Calls'
When Jim Carrey signed onto Ace Ventura: Pet Detective in 1993, he had very little pull in Hollywood and no ability to remove a sequel clause from his contract. The film was one of the surprise hits of the decade, launching him into superstardom and leading to offers for roles like the next Batman villain and a creepy cable guy in a Ben Stiller movie. Unfortunately for Carrey, he was still legally obligated to deliver on the Ace Ventura sequel. The resulting movie was a huge hit, but most everyone agrees it pales in comparison to the original and reeks of "contractual obligation." It soured Jim Carrey on sequels in general, and he didn't agree to make another until Dumb and Dumber To.