Clackers Clackers, also known as Knockers and Click Clacks, consisted of two large acrylic balls, which hung on either end of a heavy string. The two balls would swing apart and together, making the loud clacking noise that gave the toy its name. If swung too hard, the acrylic balls would shatter, sending flying shrapnel everywhere. Clackers were banned in 1985.
@Joe Riley He's using a ball-pen, I think, writing on a CD! Looking closely will reveal the 3 tiny black hooks under which the paper disc was slipped and attached, somewhat larger in diameter than a CD. Thanks for that! Frank