Originally Posted by
Xei
I recommend simply asking your friend to demonstrate his powers.
A basic rigorous test would involve him trying to move an object which he can't influence physically (so he would have to stay still, and not be able to blow it). You tell him to move it in a certain direction during a certain time period (and not at any other time). If the pen does move, and in a large majority of the time it's in the direction you told him and at the time you told him, you have positive evidence. If he can't manage this, he's talking bollocks.
Honestly, challenge him. I would. It'd be fun either way it turns out.