Was watching one of those "caught on tape" shows with my son the other night. Some rocket surgeon diver was hand feeding a Moray eel and it latched onto his thumb and not the bait.
You see the diver struggling to free his thumb for about 15-30 seconds then you hear a "CLICK" and thumb is gone.
Didn't realize they have two sets of jaws, sort of like that creature in the movie Alien.
http://en.wikipedia.org/wiki/File:Ph...moray_eels.svg
The Doctors transplanted one of his toes to replace the thumb.