Presposterous, Postposterous -- Was: "How Clever Language Is"

From the Classics-L, list, J. Isles quotes from the BBC: =20

7.s
tm>:

"Clegg warns Labour on third place. It would be "preposterous" for Labour to have its leader remain in Number 10 if it came third in terms of votes, says Nick Clegg."

and comments:

"Wouldn't it be postpreperous?"

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preposterous:

c.1540, from L. præposterus "absurd, contrary to nature," lit. "before-behind" (cf. topsy-turvy, cart before the horse), from præ "before" + posterus "subsequent."