Look mom, I flushed with no hands!
I don't know about you but I know a few "lazy flushers." Will Gorman built and documented, in my opinion, the world's best use of Lego ever to solve this age old problem of the unflushed toilet. Will built a robot toilet flusher! It uses the Lego sonar sensor to detect when someone sat down and then after the "user" leaves the toilet, it flushes!