A classic spontaneous Monty Python tribute to 'King Arthur' Yes, I'm sure this video has never, ever been seen before at MetaFilter. The way it is handled is remarkable, with Cleese calmly discussing how comedy works, and then... Klein's reaction to the chaos near the end is hilarious. [more inside]
A few sketches aired during the original run of Monty Python were subsequently lost. Half an episode, the tenth of the third series, was censored by the BBC. All that survives is the script. Also, never shot, but written, was the King Brian the Wild scene from Holy Grail. Additionally, a few sketches were either slightly censored post-broadcast or erased for other reasons. A couple of those sketches have have been found on tape [Warning: Autoplaying video]. The two sketches are Political Choreographer (here with a short bit exhorting you to support Channel 11 in Chicago), and an interstitial animation by Terry Gilliam. Also, the uncensored Summarize Proust sketch.