Until you realize it's code you wrote. Happened to me when our children were little. There were large parts of a system I'd written, sleep deprived, that I had no recollection of writing. Version control said I did, but I didn't remember it.

That can make it even better, particularly if you can remember why you were making the decisions that you did.

Yes! It's actually great -- you can rant as hard as you want because you know the author won't be upset.

Oh but the author is upset, just with themselves