Don't listen to those other doofuses, if you want to learn a weird language, I've got the one for you: Prolog! You'll never use it in industry, but a few weeks

Don't listen to those other doofuses, if you want to learn a weird language, I've got the one for you: Prolog! You'll never use it in industry, but a few weeks with Prolog will bend your mind in just the right ways and teach you more about how you can model computation differently than six months with a Lisp. It's also cool as shit and really fun to program in. Prolog is a language you can learn just for the sheer joy in expanding your notions of what programming is, or at least could be.