R+B sensation Rihanna thought she was being PUNK'D when she found herself locked in her tourbus with her dancers. The PON DE REPLAY singer spent 45 minutes desperately trying to open the airlocked door of her bus during a recent tour stop in Indianapolis. She says, "We were in the bus just chilling, waiting for them (promoters) to call us and finally they're ready for us... and we can't get out. We realised we're all locked in - me, my dancers, make-up. "We were really scared because none of the windows could open... The security guards were coming to try and get the door open. I was like, 'If 10 of y'all men can't get this door open, I'm nervous.'"