Futurama
S2E5: I Second That Emotion
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So, is it true that alligators flushed down the toilet survive down here?
No. That's just an urban legend.
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.