I see no reason to ban either one. Bum pinching along with name tags, everyone's happy. It can be up to each individual to decide if they want to pinch or say "hello" first. I'm leaning towards "get to know me, then pinch if the mood hits", but if you prefer to pinch first, go ahead. Will make for very interesting evenings, I'm sure.

Live so that when you arise in the A.M, Satan shudders & says..
'Oh sh t..she's awake!'