DOG!
Below is a real patent illustration that got published. Pat. No. 6,652,353.
But one of the most insane patents for I toy I saw is 2,929,459 for a GASOLINE-PISTON-POWERED pogo stick.
They actually *made* these in the 50s and 60s - and I saw one for sale on ebay.
PERFECT if you go hopping into a low-ceiling patio or garage, ne?