Best one I heard was at FlightSafety where RAH does E-170 training. The instructor came in to my class to show my ground instructor something. This new-hire's paperwork included his 1st class medical with his student license on the back. Apparently he was one of the zero-to-hero guys and never had to get a new medical in his lightning fast training. Needless to say the grey-haired FlightSafety guys just about died right there.