This isn't really surprising.I usually find myself wishing that Randall Munroe (author of XKCD) would teach most of my classes. Not only is he a polymath, but he's completely insane. Those are the best teachers.
I'd go so far as to say he's interested in a lot of stuff, but his actual level of knowledge is pretty much "dude with a Bachelor's Degree and access to wikipedia".
Nothing wrong with that, but let's not get too excited.