Mesmetron

Mesmetron is a Fallout 3 weapon that is used in the quest Strictly Business. When used on the specified quest NPCs, it puts them into a hypnotic stupor, allowing the player to rob and enslave them and send them to Paradise Falls. It also appears to work on some other NPCs, but often simply sends them into a berserk frenzy in which they become hostile towards the player and every other NPC in the area. Occasionally, the victim will run several steps before their head explodes.