If you're a programmer of a certain age...

If you're a programmer of a certain age ... I'm sure you've had an experience like this: you write a program, it's released, then years later you check out the source to extend or fix it – and discover, to your surprise, that you're the author of it.  It's happened to me on quite a few occasions :)  Here's a great story of it happening to someone a tad younger than I...