Sans the shoulder massage, I invented that for a high school class in 1977. It had a hose that screwed onto the faucet to power each little brush’s water turbine. And it had already been invented.
After the internet, it became easier to research if I’d been beaten. Googling 17,000 sites for “Hugh Manatee” confirmed that it was common coinage. However, I had “Death Row Jethro” for over a year with no Google returns until a pro wrestler took it.