We want to build a wearable game that can be played simply by moving your head and wearing a santa-esque hat (the ones many people wear in the winter). If you see someone else wearing the hat, you snap your head forward so that the top of that hat, the dangling part, snaps forward towards the direction of the other person. If your aim is good, the other person will register a hit and their hat will vibrate to indicate having been struck. Now we engage in battle.