With the big egos, big risks and big talent, celebs often set themselves up for some big meltdowns. But which have been the scariest and most surprising? In honor of the release of "The Beaver" -- a moviestarring noted freaker-outer Mel Gibson -- we're counting down the craziest celeb meltdowns.
15. Demi Lovato
Is there such thing as a meltdown done right? Lovato's fans reeled when news hit that Disney teenster Lovato socked one of her back-up dancers, but Lovato has used her meltdown to move in a good direction: She went to rehab, came out as bipolar, and allowed all her young followers to know one person who struggled with -- and seemed to overcome -- mental illness.