Clap On, Clap Off.....The Clapper.

[dsm]

You're supposed to have to clap twice to activate the dang thing, but one big sneeze and out goes the light. Moderately loud laughing triggers it too, or say the television is on a little too loud, or your girlfriend is a screamer, etc... This Clapper device has been around since the early 1970s or so, you would think they'd have been able to perfect it by now.