This the opening of the tenth Treehouse of Horror which took place during the fourth episode of season season 11 and it premiered on October 31, 1999 which makes this the last Treehouse of Horror to air either before or on Halloween until season 21s Treehouse of Horror XX in 2009, a full ten years later. This was also the last Treehouse of Horror to use the couch gags until Treehouse of Horror XXIV. ENJOY!\r
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