So Jean-Claude Van Damme allegedly got eight celebrity cameos back in 1992? That's nothing: When you're Conan O'Brien, you can easily get 50 famous faces to drop by. It was an ingenious way to bring star power into the mix from the get-go, with everybody from Skrillex to Grumpy Cat to Tom Arnold (who only barely squeaks by as a celebrity) getting shanghai-ed by O'Brien. The MVP award goes to either Taylor Swift, who endures Conan's awkward flirting during a manicure, or Jack Nicholson's middle finger. Check it out.