Yeah, I'm serious. I have a few old milk crates and I wouldn't go whacking my knife into one of them because I know would end up having to fix the edge. Also keep in mind that when you have something that's clamped, it's not going anywhere when you bump into it. That's one of the reasons why leaving a knife in a clamp with an exposed edge is so dangerous. If you bump into it, the knife is fixed in place and doesn't get pushed back, which would ordinarily diminish the force of impact significantly. The clamp doesn't allow it to move.You are serious...I mean about plastic? You are serious, aren't you? It was not a joke, was it?
I just need to be sure.