I was grilling steak and grabbed a knife to check the center. Yes, I know real cooks don't do that. I am not a real cook.
Anyway, as I picked up the knife by the handle, there was something poking my hand. It was a twist tie!
I gave my mother an incredulous look. She explained.
Seems my father tends to put the wood handled knives in the dishwasher. High temp water bath and wood - not a good combination. So, my mother slapped a twist tie on the knife to remind him that it is not a candidate for the dishwasher (unless he's the dishwasher).
Now, I usually prefer a more self-explaining control, but the gemba-based population within my folks' house is pretty small. Overall, inventive and a little bizarre.
Visual and tactile control - zero dollars. Time with my folks - priceless.