In New Vegas, there is an enemy called the Y-17 trauma override harness. The suit was designed to make sure that the person inside would go back to the base he was stationed at in the event that he was unable to himself.
However this suit has some problems. It doesn't know if the user dies, and if it doesn't have a home base, it will walk forever until it's given one.

If the player has a special perk called "Wild Wasteland", they can find odd and out of place things in the game, and when fighting this enemy you will sometimes hear them say, "Hey, Who turned out the lights?"

This is a reference to the Doctor Who episode "Silence in the Library", in which the Doctor went and found some researchers who had special suits. The suits had a function in which it would keep the user alive after he died through a link called "ghost data", and could make them speak by retaining their consciousness. One of the first people who died would repeat the words, "Who turned out the lights" over and over again since the lights inside his visor were turned off.