It's probably happened to all of us at least once: you are sitting somewhere that is quiet, let's say a violin concert, and your cell phone rings. Now, there's two things the person on stage can do. Either stop the show completely and call you out, or, make a joke about it. Now, a little cell phone etiquette is always a good, but, sometimes, we just forget to turn it off. What can you do? I think the guy in this video handled a cell phone ringing during his violin concert quite well.