I'm working on a software project that has a bug that cropped up in the last 8 months. I had some time to kill this evening so I decided to write a program that would compare files between the old version and the new one. I've thought about writing a program like this for at least 7 or 8 years now. So, I start looking through a directory where I keep all of my old programs for a piece of code that I wanted to use. While looking for that, I noticed a directory named File Comparer and, sure enough, I already wrote it two and a half years ago. I read through it, performed a few tests and it worked great for exactly what I wanted it for. How could I not remember this?