Hundreds of teenagers were asking that very question Saturday night at a Los Angeles concert when K-Ci of pop group K-Ci & Jo Jo unzipped his fly and exposed himself onstage. According to the New York Post, hundreds of outraged parents grabbed their sons and daughters and made a mad dash for the exit — setting off a near-riot. After the group completed their 20-minute set, they evaded police by taking off through a rear entrance. An investigation reportedly is underway. Also appearing at the holiday-themed Jingle Ball concert were Christina Aguilera, Macy Gray, 98 Degrees and Third Eye Blind. — Michael Ausiello