Ok I'm annoyed people say that just because Punisher had it aimed for Joker doesn't mean he would have killed him. Let me see I saw the picture and Joker realized soon enough after Punisher pointing his gun and saying
"I got all your treatment right here comedian."
The reality of the situation and this guy would do without a seconds hesitation not feeling bad as Joker is wretched psychotic mass murder without a concious. Let me add it was touching his forehead Joker isn't a Flash so it's very doubtful he would move out of the way.