Well, depending on age and physical condition, it could be something seemingly as benign as looking in the mirror or turning on the lights...but, I'll go with sitting on hot pavement
But if you do, let me know and I will buy stock in calamine 
Someone else beat me to it. I was going to say "use the Citizens Bank atm at South Station"
-- Modified on 7/7/2017 5:04:26 PM
The fact that two of you thought of it means there's obviously a story that I missed. Did someone actually do that?
Ole! Rodeo clown wouldn't be a good idea either. Or any clown where children are involved. Meeting your girlfriend's parents for the first time.
Meeting your state's attorney general...asking your boss for a raise (we all know the exceptions to that one ((which is what led you to meeting your state's attorney general))
Unless your are trying to straighten some hairs...ouch!