PG

The Holy Grail came out before the advent of the PG-13 rating. However, it's a pretty tame movie. Sure, there's a lot of violence and a bit of blood, but most of it is over-the top and cartoonish: a rabbit biting peoples' heads off, a knight losing all of his limbs, people being crushed by cows and giant wooden rabbits.

And Monty Python keeps all the sex and drugs on the light side… even in Castle Anthrax.