OK, this has to be a deleted scene somewhere
You know in Dark Knight where the Joker throws Batman's girlfriend out the window?
The party is over, and all of Gotham is trying to figure out what they're going to do with a psychotic clown on the loose. At no point does anyone feel the need to discuss just what the fuck happened when Batman left a room full of Gotham's wealthiest citizens completely alone with the craziest motherfucker in town.
The Joker is alone with a crowd of unarmed victims. WTF happened?