Crazy Moments When Celebs Went Undercover To Surprise Their Fans

In 2010, Funny or Die had Jewel surprising fans at a Los Angeles karaoke bar. Wearing a prosthetic nose, wig, and business attire, she played Karen, a quiet and homely looking professional who was nervous to get up and sing on stage.

With the encouragement of the crowd and her planted "coworkers," she got up there and blew the entire audience away singing a couple of her hit songs. She came back moments later, out of her disguise, to perform some more of her songs before revealing to the crowd that she had in fact been "Karen" the whole time.