I thought a few months ago that after almost 14 years together (this month was 12 years married) I had FINALLY trained my wife to treat the knives well and was ready to upgrade from my wusthoff and forchners to some good japanese steel. Alas, I still catch her putting them in the sink, rinsing them and just leaving them on the counter wet etc.
Then at Christmas I was about to carve the meat and went and got my cimitar from where I keep it in the garage in a knife roll. Now it's not a fancy nor expensive knife, but I insure it stays sharp by making sure nobody else uses it. I left it on the cutting board to step out for a minute and came back just in time to keep my sister-in-law from using it to cut the foil off a bottle of wine. I mean seriously, what the hell goes through a person's mind that makes them think a 12" knife is good for that? If she'd actually done it before I caught her I think I'd have taken a finger to teach her a lesson.
so now I have decided that I'm going to take one of the kitchen drawers and put a lock on it and make it mine. Then as I get good knives if they aren't in my hand I'll place them in the drawer and lock it, even if I'm just stepping out for a minute.