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By Michelle Lanz
Some celebs are expected to be funny (we're lookin' at you, Conan O'Brien), but sometimes Twitter gives surprising proof that some non-comedic actors have a funny bone, too. Click through to see which celebs are yukking it up on Twitter, then follow Wonderwall for the latest celeb news and gossip.
"Just had a thorough cavity search at the US customs office. Turns out I have no cavities and they even gave me a new toothbrush!" -- John Mayer, testing out his comedic one-liners in case this whole musician thing goes south (no pun intended)