When I was making my Storm at Sea quilt some 20 years ago I was using old style cutting and piecing techniques. I believe in doing all of one step at a time for consistency purposes, and so I sewed the long skinny triangles onto the large diamonds wrong on every single bias-edged piece. I carefully took them apart and did it again. And when I say again, I mean, I sewed them on wrong again!
It was bad enough the first time but the second time all I could do was mutter to myself that if I didn't like doing this I should be aware that it was all in my control and I could prevent it from happening again. And so far that mistake hasn't happened again. At least not twice in a row
I don't quite have the words down, but my aunt has a saying about "if all you can say is that it was a learning experience, that isn't saying much!" Not that learning things isn't a good thing, but how we get those experiences can really be awful.