Clackers, Knockers, and Click Clacks

Clackers, Knockers, and Click Clacks was nothing more than two acrylic balls tied to a long piece of string, regardless of whether they were named knockers, click-clacks, crackers, or any other similar name. To induce the balls to swing into each other, a person would take the central string and jerk it up and down in an up-and-down motion, which produced a pleasant banging sound that drove your parents mad. Swinging small acrylic balls about at fast speeds may appear to most people to be a safe hobby, but the danger emerges when the balls reach their breaking point.

These things would wear out after a while. They'd have to smash against each other so forcefully that they'd shatter. You might not be playing with the safest toy in the world if you expect a gratifying "boom" but instead get splintered ball parts in your eyes. Due to most parents' wish to keep shrapnel out of their children's faces, these little men were made in the 1970s and didn't make it very far into the following decade.