I realized recently that I can (and no, I won't be detailing it here1).
Was it something you did, or something you didn't do? A sin of commission, or omission?
Maybe it's something you'd change if you could do it over again. Then again, our scars define us. Would you still be the same person if you made that change?
What do you think about regret?
1The truly dedicated and intrepid among you might be able to puzzle it out, but I will offer neither help nor acknowledgment if you try.