It has probably already been invented, but I do not know for the life of me why it isn’t in every bathroom.
Today I was chastised for leaving the toilet seat up. In my defense, I’m pretty well trained in this area — but not perfect.
Anyway, it seems that the seats should be operated by a foot pedal. If you’re standing, you hit the pedal, the seat is up. You leave and the seat goes down. She’s happy because she doesn’t fall in. You’re happy because she’ll be able to find the next thing to yell at you about. I’m happy because I’ll be fucking rich for making these things.
Seriously, this should easily be a linkage-mass-spring-damper system. The engineering can’t be difficult at all. Plus I can’t imagine it adding more than $10 to the price of a seat, and who doesn’t spend $10 if it helps keep your wife off your back?
TO THE DRAWING BOARD!

Brilliant!
At the very least it would sell at a gag gift store. Patent that bitch, fool.