I think every time something turns out wrong, this kind of feelings is very common. I wish I had seen the couple of trailers I crashed into six years ago, but lots of things happened ever since and I met the love of my life. So my regret is too little, I guess. =)
None. I really don’t allow myself to regret. If I feel anything remotely close to regret, I’ll find a way to look at it only as a lesson to learn from and find a way to feel grateful for whatever it is, or see it as possible useful to me. Smoking, now that I see that listed from someone above is the ONLY thing I’ve not been able to find my way out of regretting. Lol. A lesson learned? Just can’t see it as anything other than a little regret. 🙁