The clapper, but low and behold the patent office tried to tell me that someone else came up with it first. I then left the building singing this little jingle, clap on, clap off….The clapper…Wouldn’t you know it, someone stole that too and made millions….Hmmm I am now working on a self scooping litter box but I hear that someone out there has that too….Go figure. If Al Gore can invent the internet then I sure as hell can take some credit for the clapper and this self scooping little box. I am mad genius .