As a teacher of medieval Grail literature, I have shown "Monty Python and the Holy Grail" to many generations of students -- and indeed there are a number of scenes that really do help young people understand either the medieval literary tradition or medieval history. These include not only the unforgettable "Bring out your dead scene," which educates the fortunate modern viewer on the ubiquity of the medieval Bubonic Plague, but also the Grail Castle with its unimaginable and unaskable question, not to mention the over-the-top battle ethos that would lead to a knight's having not only his arms and legs cut off but also his head! It's hard to believe that such scenes have their medieval progenitors (though I do have to say I know of no medieval precedent for the "shrubbery" scene), but honestly they do.