Randomly looking around SO, I come across this question. What catches my eye is an unusual answer in that it's not worded at all:
Seems like a bug to me...may warrant looking into.
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1Reminds me of the other recent question Potential security risk: Null bytes accepted as part of text.– PopsAug 31, 2012 at 15:24
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1 Answer
It's just a bunch of empty characters:

Likely he posted an answer, realized it was wrong or otherwise, and removed all the content within the 5 minute grace period rather than deleting it, which he should have done. He might have thought he was going to update it with a different answer later, and maybe forgot. Happens more often than you might think (not the leaving it there empty part, though).
answered Aug 31, 2012 at 4:01
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Notwithstanding that it happens a lot, why wouldn't this be filtered out as empty strings? They don't actually print anything out to the screen.– MakotoAug 31, 2012 at 4:03
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1@Makoto: See Don't count non-printing characters, HTML comments or other content not displayed toward minimum character requirements Aug 31, 2012 at 4:04
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2@makoto: If someone goes out of his way to create a post without useful content, the system can't really stop it. There is not really a point in filtering out all kinds of obscure edge cases if you can always write "ehdhududfuuhhdgufifyfujhdudh" and get around the filter anyway.– sthAug 31, 2012 at 11:22