If a jogger runs at the speed of sound, can he still hear his iPod?

That question need a nerd to answer it.
well, if you are running at the speed of sound which is in Physics hard to realize (because the kinetic energy released by your muscles need to be huge). you will be able to hear the sounds played in your device because both of you have the same speed. You can re-picture the situation as being in those planes that fly at the speed of sound. Everything inside the plane is normal, but a sound wave that have the source outside the plane can never catch it.