I provided extended support on a custom system for about a year at a former employer, where the whole dev team had left before I started. I once tracked a bug d

I provided extended support on a custom system for about a year at a former employer, where the whole dev team had left before I started. I once tracked a bug down to a confusing line of code that looked like it shouldn't be there. Removing this line fixed the bug. When I looked in the commit history, that line was added as the only change in a commit that had no comment. I never worked out what they intended, e.g. whether it was a fix for something else I hadn't considered. In fact, and this is probably hard to believe, I don't think there were any comments anywhere in the commit history. Fun times.