I used to joke that, sometimes, when someone in my family comes down and sees a mess of code up in Emacs on my screen that "No, really, I'm playing a video game. It just looks like work." Because I find coding fun. But the fact is that I also play games, and Portal 2 was definitely a brain-bender.

But not as brain-bending as Haskell.

That said, I just finished the first exercise in Seven Languages in Seven Weeks, although really I'd think it's more like Seven Languages in Seven Days, given my ferocious language consumption-- I just skipped right to the Haskell part, because I have a project that requires Haskell at the moment. Still, this was pretty cool. Don't read further if you don't want the answer.