I was thinking the other day about an alien that cannot change the shape of its mouth but can its anus, so has developed speech via the anus.
And as a result lives of gassy foods like beans and onions.
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@lydiaconwell I seem to remember that in Burroughs' _Naked Lunch_ there's a story about a man who teaches his own anus to talk. (According to Wikipedia, there's a recording of Frank Zappa reading that part of the book.)
@josemanuel Oh yeah. I've not read that book but it's mentioned in the movie too.