Virtual Reality
It all seemed so simple to begin with. They'd all played the parlour trick where you stand in a doorway, close to one side, with your arm straight down by your side, but pressing outwards. Nothing happens of course, because your arm is pressing against the door jamb, and what are you going to do, make the opening bigger? After a couple of minutes you step away from the doorway. Then, if you relax, your arm will of its own accord start to rise. You've played a trick on your body. Except Nick...