Anybody remember "Click Clacks"? ("Kerbangers" "Clackers", etc.) My brother had a pair before they were banned and my dad took them away. Good thing too because they were made out of glass (or glass-like acrylic) and were prone to shattering -- as glass balls being slammed together would be expected to do, go figure. I guess some kids actually got injured hence the ban. They were around in the early late 60's I believe. Not sure of the exact year.
Dude, we were still playing with those things in elementary school in 1972! Yes, they were banned, but only after countless windows smashed, facial bones breaking, concussions, etc. Clack clack clack (double clack double clack!) I remember them being acrylic. Mine were green.