I'm amazed that no one has mention those glass "clacker" balls on strings that you could play with until they shattered into a million bits and lodged in your eyes. Or the Amazing Stretch Armstrong (TM) with mysterious radioactive red goo... man he was fantastic. My husband actually managed to stretch him through an entire house, around corners and everything, hoping to create a giant Armstrong backlash, but he just kinda oooozed back into place when let go. Bummer...
and they still hung on the powerlines in my neighborhood several years after the fad had run its course.
We had them in the early '70s- we called them "Deely Bobbers." Not sure where that name came from.