Well...where to start?
The simple humour of it all. No explanation needed. Some things are very clever, some of them are just so simple it can be. Example:
Another thing I like with the Pythons is how they turn rather grim or normal situations silly, but the people in the scene doesn't appear to think that something weird is going on.
Examples:
And ofcourse, the improvised stuff:
Indeed, that scene is mostly improvised. The guards (non Pythons, as you may notice), where told to try not to laugh, but if they would crack up, then they had to stay in character. You can see how Palin makes up the name "Incontinentia Buttocks", and you can even see him grin after saying it out loud.:rotfl:
And here is the best bit from the Holy Grail:
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