My crappy knives are the ones I don't mind abusing. I won't mention why (long story involving my pos blinds) but I needed to cut the top off a few coke bottles right behind the flange at the end of the cap. The plastic is really thick there and even the sharpest of knives have to be forced through it. So I set the bottle on a scrap board, laid the blade of my cheap Smith & Wesson knife on the bottle and smacked it with a hammer. Took a couple hits but the top popped right off. The edge rolled like crazy and now the knife seems a bit harder to open. In hindsight it was pretty dangerous but, I got the job done and I get to play with my wicked edge some more.