Binro the Heretic - 2018-09-09 HA! Mom used to get this. I remember cutting them open to get the big plastic ball out of them after they were used up. You could get balls out of all the roll-on deodorants back then.
You couldn't do much with them. I remember we used to send them crashing into each other down Hot Wheels tracks. We tried playing marbles with some one time, but they were too irregular & light. Mostly we threw them against brick walls until they shattered.
It was the 1970s. We didn't have the Internet, okay?
cognitivedissonance - 2018-09-09 My childhood bestie was the son of the local mortician. I kept noticing he had these unusual yellow rubber balls with a slight convex indent on one side, and I asked one day what they were.
"Replacements for when they take the eyes out for transplant," he said.