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I suppose it has something to do with pants having two "pant legs". Then a again, a shirt has two arms, and a brassiere usually has two cups. But still, as a whole, it does not really make sense to to me to treat "pants" as plural... unless you cut them in half with scissors. But then you have another problem, because "scissors" is also treated as plural.
 http://en.wikipedia.org/wiki/Minor_characters_from_The_Hitchhiker~*... Edited 2008-05-08 11:50 UTC