A nice note to not put anything you don't want other folks to see in software, even in testing. We wrote a system for a client once. And there was a particular

A nice note to not put anything you don't want other folks to see in software, even in testing. We wrote a system for a client once. And there was a particular functionality that I had to iterate over quite a bit, trying to nail down evasive, frustrating bugs. Needless to say, later, when the client was printing out some invoices and discovered one with several notes reading "F** F** F**!!!!", we got a phone call. We, clearly, didn't managed to scrub the DB properly when we installed it. We were graced by the fact the clients children were in during the weekend, and they felt maybe one of them had managed to add commentary to the data. "Yea! That's what it was allright! It's all fixed now!" Anyway, software never forgets. Version control is forever. Be gentle when adding commentary to code.