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?