Shaving someones head

[thebluemonkey]

If I was to shave someones head as a prank whilst they were dead drunk or even just pretty out of it would there be any legal comeback ?
Now whilst I would hope that no decent police officer would bother pursuing me the problem is that his Dad's a lawyer, who doesn't like me. I just want to see what the most trouble I could get in is so I can weight it up.

[thebluemonkey]

Thanks for the replies. It was what I was expecting but I wanted to make sure there were no loopholes. Thanks again.

[thebluemonkey]

Problem is with that is, still done for assault and only done half the job, might aswell go the full hog. But cheers anyway.