https://techcrunch.com/2016/10/10/disney-builds-a-jolly-one-legged-hopping-robot/

The wonderful thing about tiggers is tiggers are wonderful things. Their tops are made out of rubber, their bottoms are made out of springs. They’re bouncy, trouncy, flouncy, pouncy, fun, fun, fun, fun, fun. But the most wonderful thing about tiggers is that I’m the only one. IIIIII’m the only one!