One of the most popular blogs of last year was one entitled Email is broken (and my embarrassment). The embarrassment that I outlined was a (in my eyes) a monumentally stupid use of reply-to-all.
It was a regret that lived with me for days, and still makes me feel embarrassment when someone reminds me of it. I wished, at that point, that I had an undo or ctrl+z for time.
Kathryn Schulz talks about regret in her TED talk from last year. She doesn’t tell us to simply get over it, she has a much more interesting take on why regret is a good thing.