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Okay, here's a fairly obscure one.

Normally, if you edit a post, then undo all your changes again within the grace period (manually that is, rollback doesn't work), the revision will be silently deleted.

However, if the last editor was Community, typically because the question was closed as a duplicate, then it doesn't happen, and an empty revision stays behind. Strangely enough, it has to be Community; anonymous editors don't count.

An example of these empty revisions can be seen here (revision 3, click the third button in the left).

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  • Was playing around with nasty roll-backing, apparently one can rollback to the revision of another question. :S Commented Mar 19, 2012 at 15:07
  • @TomWijsman Well that's not terribly relevant, but you should report that.
    – a cat
    Commented Mar 19, 2012 at 15:14
  • Not really, because this can be useful as long as it has no side effects. Commented Mar 19, 2012 at 15:24

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