One of my CS professors told the story about when MCSFT demonstrated their implementation of the Korn shell at a USENIX conference. Gasbag on stage tells the guy in the question line that he (questioner) has misinterpreted something in the software's original intention. Gasbag figures out something is up when half the room cracked up. The guy at the mic was David Korn, author of the Korn shell.