... and then instantly regretted doing it?
For instance:
I was 11 at the time and went to a school where there was a nearby lake. While waiting for the train one day me and my brother saw a Coote (bird found by most lakes, black and white in colour) swimming in the lake minding its own business. Needless to say I said to him "I bet I could hit it with a stone". Now this bird was all of 30/35 yards from the shore but call it a lucky shot (not for the poor bird) if you will, I threw a medium sized skimmer out in its general direction and caught it flush in the head :eek: It turned upside down instantly and its little legs were flailing about in the air. I nearly **** myself and threw out sticks to see if it could grab onto something and stop it from drowning but to no avail as it was so far from shore. To this day i remember that incident vividly and I'm not prowd of it but if you asked me to throw something so precisely I'd be doing well to get it so perfectly once out of twenty times I'd reckon. Anyway, I'm sure God will forgive me in his ultimate wisdom

What have you done that made you feel really bad afterwards?