CryptoKitties lets you exchange a made-up thing called Ethereum for fake cats. Naturally it's the next big thing in the super convoluted world of cryptocurrencies, where people spend a lot of time cooking up fancy new names for pyramid schemes. Like people who hoarded Beanie Babies back in the day, digital collectors are gathering and breeding fictional cats in hopes that they will eventually be able to turn their furry $5 investments into hundred thousand dollar payouts.