Let us not forget the time that an engine DID fall off of a Delta jet.
It was only a 737-200, though. It was here at DFW- he took off, saw the vibration indicator climb as fast as the altimiter, and then it just... fell off. They showed shots of it on the runway. Very cool. A schoolmate of mine was the daughter of the pilot of that aircraft.
And that was... nine and one half years ago. If I told you what grade I was in at the time, you would realize that I am just another college kid on this forum, so I won't tell you that.