She gave up on "funny" stories, pointing out to Mike that such were just fantasies, not real, and tried to recall real incidents.  Practical jokes?  All practical jokes supported Mike's thesis, even ones as mild as a dribble glass - and when it came to an interne's notion of a practical joke - well, internes and medical students should be kept in cages.  What else?  The time Elsa Mae had lost her monogrammed panties?  It hadn't been funny to Elsa Mae.  Or the- She said grimly, "Apparently the pratfall is the peak of all humor.  It's not a pretty picture of the human race, Mike."