My mates and I used to play a game whilst out on the razz where you would lick a strangers hair without them knowing, if you got caught, nil points, think it came from a Vic & Bob sketch.
Our local MP in the 90's was Sebastian Coe, we were at the same 'function' one night and after a few beers I saw the opportunity, stood behind him, leant over, tongue out, contact with hair, retreat realising that he had not noticed, get in.
I've licked Seb Coe's hair without him realising.