You have been standing there admiring your reflection for quite some considerable time, when your reflection says 'are you going to get out of my way or do I have to punch you in the nose?' You are somewhat taken aback as you realise that this mirror is not a mirror at all, but a doorway, and your reflection simply a lookalike standing on the other side. You can get out of your double's way, or if you would prefer, you may wait to receive a punch in the nose.