A person getting drunk enough at a party to wear a lampshade as a hat. It's hard to pin down the origin of this trope. One theory is that the guys get drunk enough to mistake lamps for hat racks. If that's true, this trope could be Older Than Television. Another theory is a citation on this web page, the idea of a drunk wearing a lampshade goes back to at least 1945 in the U.S. - and probably even earlier (Another article dates it to 1928.) It has also been suggested that this originated as a piece of "dirty" physical comedy: the man puts on the lamp-shade, exposes himself, and asks for someone to "turn him on" using his "switch".