Why do Imagine Dragons dream about mythical creatures?
Because they're believers.
Okay, listen up, buttercup. It's a play on words. "Imagine Dragons" is a band, and the joke uses the band's name to make a pun. Get it? Because they are "believers" in mythical creatures and the band name sounds alike. You probably didn't. You are not smart. Your IQ is probably the same as the amount of brain cells in a baked bean.