fanfiction-batman: What Kind of Idiot? by eaglerayys

Summary:
There was an unspoken rule amongst the regular hitmen and mercenaries and everyday assassins of the world: Gotham City was left to the idiots in colourful masks and costumes who liked to antagonize actual superheroes. If you were a typical black-ops-turned-blacker-ops ex-soldier trying to make your mark, you knew to leave Gotham hits to the likes of the real “villainous” mercenaries. Everyone knew that Gotham was a different beast, and if you weren’t anyone special, the Bat and his army of terror would eat you alive.

Or

Someone put out a hit on Bruce Wayne, and for some reason he is really hard to kill.

(5 times hitmen fail to kill Bruce Wayne and 1 time one doesn't even try)