It takes a lot of skill for an actor to master a foreign accent. But when they pull it off, like Heath Ledger did as a cowboy in Brokeback Mountain or Gwyneth Paltrow as a Brit in Sliding Doors, it's a huge success. When they fail, however, it can ruin the movie and their reputation. Some actors actually become famous for their botched dialects, like Keanu Reeves in Bram Stoker's Dracula. Others learn their lesson and never try again—like Tom Cruise, who, probably due to his mangled Irish lilt in Far and Away, was the only actor on the set of Valkyrie who didn't try to sound German. Regardless of the outcome of their attempts, here are our top 12 picks for worst on-screen accents.