Batman is in a bad situation... he has woken up completely strapped into a chair, with a revolver glued to his hand.
Across the room stands Wade Wilson, Merc with a Mouth and Nutcase for Hire.
Wade: Well Batters from what I hear through the nuthouse grapevine is that you hate guns... well lets see.
1. Bruce can not escape the chair or drop the gun, and it is loaded with real bullets. Deadpool makes sure to stand where the bullet would have to hit him in the head.
2. Bruce knows that Deadpool is a psycho and has killed 100s if not 1000's of people, but he does NOT know he has a healing factor, so far as Bruce knows shooting Deadpool will kill him.
For Deadpool to win he must cause Bruce to shoot him, however he can not hurt Bruce physically, he may only talk to him.
For Bruce to win he must either convince Deadpool to give up, or last for 3 days. (he does not know that it will only be three days, and Deadpool will lie about it.)
So who wins.