Post Made Community Wiki by Ben Webster
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I'm reminded of the following story that I posted on my personal web journal a couple years ago:

At the Topology seminar yesterday, the speaker presented a theorem, which he immediately followed with a refinement: a statement that directly and obviously implies the theorem. He labeled his refinement a "corollary". I turned to Noah Snyder, and said that it was more an "uncorollary, or an anticorollary", but as soon as I said as much, the two of us simultaneously correctly labeled the refinement as a "rollary".

There should be more rollaries in mathematical writing.