I remember those. LOL, it reminds me of these others during that time. It was two baseball sized glass or plexiglass translucent balls on two ends of a long string. If you held the string in the center, and moved your arms up and down enough, and fast enough, they'd clack together up and down. Hard to explain. Got kinda old real quick, and was a bit dangerous if you messed up LOL. I wish I remembered what that dang thing was called LOL.
