Monty Python and the Holy Grail is a hilarious movie.  However, most people consider the movie to be either a classic or crap.  So, although you will probably consider this movie to be a classic, you may not like it at all.  However, if you have seen this movie previously or have seen other work by Monty Python, and you are considering whether to buy the DVD or the video, buy the DVD.  You not only get to watch the movie, but the extras are the best, funniest,and most plentiful of any DVD I have ever seen.  The most notable extras are the theatrical trailer, the Lego "Camelot" scene, and the educational video on how to use coconuts.  Without a doubt, it is worth the extra money.