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1.
A contradictory contribution.

Also can be used in the form "Contrabictory"
Adam: The best place for the water cooler is in the north-east corner of the office.

Kelly: Obviously, with the kitchen in the south-west corner, the water cooler should be in the south-west corner.

Darren: Thank you for your helpful contrabiction Kelly.
by The Noam Gnome May 03, 2011