What's your most "Which idiot did that?! Oh, it was me..." moment you've experienced?

Personal story

> Wrote some backend, database-interaction code
> Found a bug that would cause cascading deletes instead of just deleting a single record
> Did some research and found it was because a parameter was missing from a function
> Parameter was clearly documented
> Went on a quiet rant like, "This is clearly documented, which idiot would do something so silly?"
> `git blame`
> My name comes up for "last edited"
> "Oh... what an interesting solution to that problem"
> Quietly fix the problem and feel like a nonce