In the up-and-down world of cryptocurrency, so-called "meme coins" are perhaps the most bewildering. The joke-inspired digital currency is all over the internet with new tokens popping up every day by the thousands. The value of some jumped thanks to viral trends or celebrity endorsements. But most never take off, crash or disappear. Economics correspondent Paul Solman reports.

Neha Narula, Digital Currency Initiative Director, MIT Media Lab:

"I would almost think of it more like a game than a joke. Like, people are just enjoying owning these things, playing with these things, buying them, selling them. They think they are funny."