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The writing in that episode is insane when you consider how much they managed to pack into such a short run time. The entire evolution of life and the building of society complete with religion, the story a parent raising Bingo before seeing her head off as an adult and then dying, and also two parents fighting over cheap furniture assembly and then making up. It all happens in just a few minutes and much of the story will certainly go over the heads of many young children watching the episode, but it ends up being perfectly enjoyable to everyone anyway.