Me: "If you're going to have gun laws, which we do, even though I think we shouldn't, then there has to be a definition of 'gun'. Otherwise you could say 'Well, I took the front sight off it, so it isn't a gun anymore, because I took it apart.' I mean, how far do you have to take it apart before it is no longer a gun?"
RX: "...ultimately, all laws are based on reductio ad absurdium. Er, absurdum."
Me: "Yeah, 'absurdium' is the ore they dig up to make laws out of."
RX: "Law is the dross from refined absurdium."