LOL I seen something similar to this a few months ago. I have a friend that is kind of quiet and hates to be touched. Anyway he was passed out at a party and some guy we know was messing with him pretty bad, pulling his hair trying to wake him up etc. Anyways my friend woke up and went bezerk on him, I mean really flipped out. After that he never messed with him again and I dont think any of us will after seeing that. I think you should try talking to him first, telling him you had some surgery on your head or something if he doesnt stop you might have to take the bezerk route.