This movie probably is the funniest movie ever made.  I'm completely serious.  No movie is quoted nearly as often -- for crying out loud, it came out 25 years ago and people still recognize lines from it.  You will start laughing in the first minute or two, and will not stop laughing, or even slow down, for the entire duration of the film.  I have often wondered how these Monty Python guys ever came up with so much random hilariousness.