Remember Klackers?

Others remember them too. See NostalgiaCentral.com and TimeWarpToys.com.

Who invented them though?

I don’t know if he was the first to invent them, but my father did invent them in 1949, and took out a patent (GB625695). Not that it gave him any benefit, nor the public. The public had to wait 20 years for the patent to expire so this toy could be manufactured without my father being able to hold it hostage – not that he would have done, of course. ;-)