Like, I suspect, many people, I first watched Monty Python and the Holy Grail before I really knew the first thing about Arthurian Legend, and rewatching it after I do adds extra layers to a lot of the humor.

For instance, the sequence wherein Lancelot "rescues" Galahad from the castle full of women who at the very least have Designs On His Virtue, Galahad protesting said rescue all the while. Funny on its own merits, but absolutely hilarious when you're aware that, in many versions of the mythos, Lancelot is Galahad's father.