Futurama
S2E5: I Second That Emotion
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Then what are those?
Crocodiles.
We keep them as pets.
Then, when they grow too large we flush them down into the sub-sewer.
Some say there's a freakish race of sub-mutants down there.
Please, that's just a sub-urban legend.
Oh? Then I suppose you also don't believe in...
El Chupanibre.