I remember a friend showing this for the first time. He was showing me all the commands that you could type in to get information, y'know like LOOK, TAKE, GRAB, etc. and then he showed me the command DIAGNOSE. The description after this command in this particular location said something like, "Your NOSE is cold and running.". So I wanted more information and asked him to type DIAGFACE. He looked at me like I was a moron.