Have you ever started asking a question on SO and then find out that someone had already asked it. And the person who answered it was you? I seem to find myself doing this fairly often.
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I had the inverse happen (not to me) once: I saw a question that I remembered being asked a while ago, but could only remember the kludgy solution, so I decided to post it just to bump the question up in the hopes that a greater CPAN guru would post a better answer. As I was posting it in flew said guru who ended up posting two different and superior answers. Turns out he only knew the answer because he had asked the exact same question, which was the question I remembered not remembering the answer to.
So in the end, that's really nothing like what you were asking about. No, I haven't. Sorry.
No. But I have read an answer, thinking "that's a great answer", only to realize later that I wrote it. So far I haven't seen one of mine where I thought "wow, that's crappy" -- though I have edited a few to make them even better. :-)
The crappy ones usually get discarded before submission or shortly thereafter.