...only a day after I created it! Basically, they had to kill a mafia don and take his corpse to the police station as proof to collect the reward (they're very open-minded ;-) ). He is flanked by two bodyguards with Uzi's, so it should have been pretty hard.
Unfortunately, one of the cops had wandered into the Mafia house as well, and decided to also shoot the mafia don as soon as he retaliated to the bullets coming from the player. So basically the player had a free "henchman" helping him out, which made the job considerably easier. Still, I'm very proud that they even discovered the mission and knew how to complete it.
[This posting refers to GTA-MUD, my mud based on Grand TheftAuto.