Intros
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This is the opening, set to Ke$ha's "Tik Tok", from the episode "To Surveil with Love". It was originally posted to YouTube by ltickett.
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Opening to the 138th Episode Spectacular with a jumble of couch gags
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Opening to "Treehouse of Horror IX"
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Originally posted to YouTube by sandoola, this is the intro to the episode "MoneyBART", a bleak scenario created by British artist/political activist.
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400th Episode intro in 2009.