Actually, on further thought, The Princess Bride might be modelled pretty well using the D&D rules. First, Wesley's DM had him climb the Cliffs of Insanity. Then he had to face a challenging sworsman. Then a giant. Then he took poison, and while he may have spent several years developing an immunity, he might have still taken incidental Con damage. Then he rolled down a hill. Then he went through the Fire Swamp.
Then, and only then the DM used the "mooks with crossbows" bit. The Dread Pirate Roberts was down on hit points, and had perhaps taken some ability damage. Softened up that much, it is quite possible that the mooks offered a serious threat.
RC