"Sometimes good people do bad things"... really?

I have a question... Have you guys ever been in the situation where you get the chance to do something? Something wrong, and you know it is wrong, but then you still do it for all the wrong reasons. Actually you don't know the reason, you just do it. I hate it! Of course while it is happening, there are no regrets yet since the consiquences and stuff still hasn't gone through your head yet. But then after you do it, you get all these bad feelings and regrets. Have you guys ever been in that situation? Take my advice and try to ignore those...