“In an episode of Friends, Monica becomes obsessed with a light switch that, according to Joey, does ‘nothing.’ Monica, convinced that it must control something in the apartment (‘They wouldnt have put it there if it didnt do something!’), begins an obsessive hunt to uncover what the switch does. Though its scarcely more than a silly subplot, Monicas dilemma exposes an interesting household problem: Every home seems to have a mysterious light switch somewherenear the back door, next to the porch light, at the basement stairs, along a row in the den. A light switch that does nothing….”
