Three years ago we went on holiday with friends and got into playing a card game in the evenings. I'm not very good at the game so I cheated and won. There was nothing at stake except pride but for some reason I feel really guilty about it, even years later.
I also know that one of the friends knew i had cheated (because of something he said) and so i feel embarrassed that he knows i did it - it's so tragic for a forty-something woman to cheat in a card game! I bet nobody from the holiday but me remembers it but it's one of those things that plays in my mind during quiet moments.
What silly thing are you riddled with guilt and/or embarrassment over?