Contract Killer

Contract Killer is a perk in Fallout 3.

Description
You will get a note from Littlehorn & Associates telling you to go to the scrapyard. Daniel Littlehorn, the CEO, resides at the scrapyard office. He offers a contract for the ears of each "good" people. He will pay 10 caps per ear, unless the Lone Wanderer has -750 or less Karma, at which point they will pay 15 caps per ear. This is determined by your Karma before the turn in, not after. Each ear will give the Lone Wanderer -10 Karma, regardless of their current Karma. If you are 10 Karma away from -750 and you have multiple ears, dropping all but one and doing 2x the turn ins will net more caps.

Bounties
With this perk, the player can remove an ear from every good human or non-feral ghoul character he or she kills. The ear can then be sold to Daniel Littlehorn at the scrapyard for 15 caps and -10 Karma.

Bugs
When essential NPCs are knocked unconscious, it is scripted for an ear to spawn in their inventory. This happens regardless of whether they are "good" or not. The ear will spawn every time they're knocked unconscious, for a potentially endless amount of ears.