The Office is up there with Monty Python's Flying Circus for me (I've even rolled off the couch laughing with some parts of it!).
I enjoy The Office, Extras, his stand up, the podcasts, the books... So many facets of his humour! He seems to be an originally smart, well-educated man. His interests vary from art to science, animals and history and that shows a lot in his work.
Personal favourite: the extras from all the DVDs. Especially the pig-boy parts ;D (and his hysterical laughter. I can't help but laugh out loud when I listen to it!).
With no proper training he's managed to be a great actor. I find that his straight face can convey more feeling than any known actor.
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