Hopper Popper

Grandpa is seen here putting a hopper on Eli's head.  It bounces off a little higher from the head, than a hard surface. 
One of my favorite pass times of this particular hopper-popper is when John, my brother, put it on Jeron's fore-head and it created a large bruise, perfectly round.  My mother went to the doctor and she asked what it was and my mother had a heck of a time trying to explain what it was.