From Cracked.com, of course:
[The villains of Gotham] keep charging at Batman one at a time, even with 13 of their cohorts lying on the ground with broken collar bones. We’re not suggesting they just walk away and give up their life of crime–we understand that anybody who’s signed up to be a henchman for The Joker probably isn’t qualified to do anything else. But maybe you should fall back and try a new strategy. You’re not going to be the first guy in history to punch Batman into submission. Leave until you can come back with some dogs.
Of course, Batman will have a plan for that.
Because he’s Batman.