Somehow I lack the energy to bring any of my inventions to fruition. This one has to be worth a lot, but I'm just giving it away, right here.
Consider a toilet equipped with a camera and some excellent video analysis software. When a person approaches the toilet and prepares to use it, the toilet controls the seat according to what is visible on the camera. If buttocks can be seen, the seat is lowered. If the user is facing the toilet, the seat is raised or lowered appropriately..
The hardware for the camera and its controlling software must be extremely simple and positioned so that anyone can easily verify that the device is not connected to the Internet.