Since most people are too scared or lazy to get their "ass" onto a scale to see how fucking fat they are
how about a toilet - scale?
Watertight - can be put between the toilet seat and the toilet with pressure sensitives.
Go do it - thank me later
Toilet scale is a good idea actually...would make for good conversations.
How about someone invents something that you can attach to your existing stuff that would roll up their cords at the touch of a button? Tangled and knotted cords =

Also, we should have a vacuum system in our houses that suck garbage into the garbage cans in the garage so as soon as something becomes garbage it is out of the home and we don't have to empty all the garbage cans.....maybe have the system even suck the garbage out to a container by the street so we don't have to take the garbage cans to the street.