Wadsworth

 is your personal Mr. Handy butler in Megaton in the year 2277, which you get, together with a house, for disarming the nuclear bomb that lies in the middle of the town.

Interactions with the player character
He can give you instructions on how to spruce up your house, give you haircuts and tell science-related jokes (only one at a time, so he can recharge his 'humor emitter array'). Wadsworth can also give you Purified Water, but only five at a time before needing to recreate his supply. It takes 7 days for him to recreate his supply.

Quotes
These are just jokes


 * I was going to the clairvoyants' meeting, but it was canceled due to unforeseen events.
 * Did you know that the best contraceptive for old people is nudity?
 * It is common knowledge that irradiated cats have 18 half-lives.
 * Two cannibals are eating a clown, one turns to the other and says "does this taste funny to you?"
 * Photons have mass? I didn't even know they were Catholic.
 * I once visited a crematorium that gave discounts to burn victims.
 * Two atoms are sitting in a bar. One says to the other, "I think I've lost an electron." The other asks "Are you sure?" To which the first replies, "I'm positive."
 * A neutron walks into a bar. "How much for a drink?" To which the bartender responds, "For you, no charge."
 * War does not determine who is right - only who is left. (Actually a quote from Bertrand Russel)

Bugs

 * If the player kills Wadsworth and then reloads a previous save, it is possible that Wadsworth will become a floating corpse of himself.


 * More often than not when interacted with in the afternoon Wadsworth will still say "Good morning sir" regardless of the time.(Tried and tested by waiting 1 hour after every interaction, and by map traveling to rivet city and back to use up time) (Xbox360)


 * Sometimes Wadsworth will stay at your bedroom, then you cannot get inside to sleep. (Xbox 360 and PS3)


 * Sometimes if the player is not aligned with Wadsworth's eyes while getting a haircut, half of players face will be cut off from the screen. (Confirmed on PC)


 * if you crouch, then talk to Wadsworth and ask for a haircut, the screen will show the player's pelvic area. (PS3)


 * Sometimes, if you kill Wadsworth, exit your house, and reenter quickly, he will have disappeared. (witnessed on PC)
 * When speaking with him, it is possible the focus-changing animation and his movement may result in a bizarre instance of the PC occupying the same space as him. (Xbox 360)
 * He sometimes confuses the PC condition phrases: you may enter your home in full health and he advises you to seek medical attention; conversely, he might say, "It's good to see you alive and well, sir" when you're seriously wounded.
 * He can also get stuck on your bed and can't get out. (Xbox360 Confirmed)

Appearances
 appears only in Fallout 3.

Behind the scenes

 * The joke, "War does not determine who is right- only who is left." is a quote from Bertrand Russell.
 * The joke, "Photons have mass? I didn't even know they were Catholic!" references a similar joke from Angels and Demons, by Dan Brown.
 * His name could be a reference to Tim Curry's Character "Wadsworth The Butler" in the movie Clue. In the movie "Wadsworth" is a rather cynical butler with a distinctive english accent much like the "Wadsworth" in Fallout 3.