Why didn't you think of this before? You pull out your phone and give it a try. It's not working properly. The screen is flickering and not responding to your touch. It's making an awful racket too - playing Abba's Fernando backwards at half speed with the volume overcranked so it's clipping all over the place. Holy Mary Mother of God what the hell is happening? It's a video, playing all by itself! A video of a face. YOUR face! Covered in blood! Screaming and screaming! Oh my God it's horrible. I'm surprised you're not peeing yourself right now. Jeez, turn that thing off! Anyway, needless to say it doesn't look like your GPS is working. So what now?