Like a roomba, but for your walls and ceilings to keep cobwebs away.
Invent a pretend board game. It doesn’t have to be functional, you could make it funny.
I want a machine that punctures car tires of people who speed on our road.
Or, how about a machine you can attach to your kid so that when they use a bad word, it automatically slaps them.
Or, here’s a real idea. I have a house on three levels and I have to check up and down the house to see if the lights are off before I go out or go to bed. I would like an app or something that I can just look at where I am and see if and or where the lights are on in the house or perhaps I can turn them off from there as well. Laziness.
Personalised superhero suit. Like Edna Moe from Incredibles.