I came home about 1am and saw a bug in a small (unpaid...) project that had to do with timezones (see some earlier rants). Fixed it, got to bed.
A few days later I realized that a feature I implemented before was gone. Going through the git log I found out it was me in that night who removed it, by accident I suppose.
Not the end of the world but I was quite intrigued by my own drunk ability to remove a feature that had nothing to to with what I was doing and not even noticing it.