It was one with a message that someone copied from a commit I had made a full year before. It broke the build right before a release and the commit message bore no relation to the changes, of course.
Because they had copied my message, it had my initials in. I had visits from irate managers in other buildings who ranted at me for a good 5 minutes without letting me get a word in to tell them that 1) it wasn’t me, and 2) undoing a subversion commit was a one-line command and not a good reason for the stupid amount of drama (there were no database or other irrevocable changes).
The last manager to speak to me told me it was still my fault as it was a bad message in the first place. The message read “Fixing typo in the audit log”.