What's with Humans and Fleas?

If it's not bad enough that Momma has decided to adopt some fleas as pets, Pops has been playing this game on his Xbox about a Greek King named Jason and his astronauts (why are they called astronauts if they're not in space?) killing monsters in search of the Golden Fleas. What is this strange human obsession with fleas??? I thought dogs are supposed to be their best friends? Humans are weird!