Flying a helicopter by instruments is difficult unless you do it every day. One afternoon on the tower frequency I heard a pilot report matter-of-factly that he had joined the holding pattern over the outer marker beacon at 3000 feet. Immediately, another voice cut in. “You can’t be there!” it said in panic. “I’m holding at 3000 feet, too!” After a pregnant pause, the first pilot’s voice came back on the air. “You idiot,” it said. “You’re my co-pilot.”

Frank Davis, in Reader’s Digest