Murphy's Bombing Run

 refers to an unmarked and repeatable quest in Fallout 3.

Walkthrough
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 offers to pay you 15 caps which can be increased to 30 caps by passing a Speech check. You can then purchase 1 Ultrajet from him (around 70 caps each) for every 8 boxes of Sugar Bombs you turn in.

Bugs

 * Sometimes if you give him over 8 Sugar Bombs at once the speech option to give him more will disappear. To correct this reload the game.
 * If you take Sergeant RL-3 or Dogmeat to see Murphy in the station, they may attack Murphy and his bodyguard. If this happens, both ghouls will not become hostile. (unconfirmed)
 * There are some instances where Murphy will take all your Sugar Bombs but give you no caps. The only known way to fix this is to save before giving him everything.