9. Arnold Schwarzenegger - Batman & Robin
Arnold Schwarzenegger has never been able to act, but that never stopped him being a great movie star, and he has in fact been in many good movies such as The Terminator and Total Recall, but his performance in Joel Schumacher's beyond disastrous Batman & Robin is one of the worst screen performances of all time. Granted, the script doesn't help the big man's cause but his hammy delivery of the horrible puns just descended us all into despair. The thing is, Arnie actually looks proud of himself as he's delivering the 'jokes', completely unaware of the disaster he's participating in. Arnie has always overacted in everything he's been in and his almost self-parodic performance in Terminator 3: Rise of the Machines was a contender for this list, but ultimately, this is a performance the former Governor of California should be ashamed of. It's actually one of the most depressing performances on this list, as the former bodybuilder and action hero was resorted to camping it up for cheap laughs in one of the most strange and abhorrent movies ever created.