A couple of weeks ago, I knocked a baritone sax player in the head with my headstock and he jokingly gestured to hit my groin area with his instrument. Lucky for me he was still smiling.
I got this friend (it's always a friend) who beaned the legendary Robert Gorden in the head with his upright.
Who was that guy that said "the best defense is a good offence"?
The trick is to make it look like it's unintentional.
jc