What man invented the “self cleaning oven”? I never clean my oven. It is older than I am and gets hot enough in there to kill anything harmful, so what is the purpose? Just something to keep some housewife busy (like she didn’t have enough to do). So she probably asked her husband to help lighten her load by cleaning the oven. He realized how much work that is/was and decided he would come up with a way to make ovens self cleaning. (Which, from my knowledge, is more like a light cremation and still requires cleaning!)
He could have done all of us a favor and come up with a self-cleaning toilet instead.