Murphy's Bombing Run

 refers to an unmarked and repeatable quest in Fallout 3.

Murphy is a ghoul scientist stationed just inside Northwest Seneca Station who is working on an improved version of the drug Jet, known as Ultrajet. However, he needs your help with one of the ingredients: Sugar Bombs.

For every box of sugar bombs that you bring him, he will pay you a decent amount of caps. You can then purchase Ultrajet from him as you turn in Sugar Bombs. It seems you can purchase 1 Ultrajet from him (around 70 caps each) for every 10 boxes of Sugar Bombs you turn in.

When you first talk to him and discover he is making Ultrajet, he offers you 15 caps per box of Sugar Bombs that you bring him. You can convince him to pay 30 caps per box by passing a Speech check.