I just ran across a mention of my name in the Changelog to memcached, from 2004. I had forgotten ever contributing anything. In fact, I was having a hard time figuring out what I would have been working on in 2004 that would have been using memcached.
Mind you, I remembered after a moment or two, but it took some serious thinking.
The interesting thing is to realize that I was apparently a fairly early adopter–the entry for my bug report is almost exactly one year after the first entry in the changelog.