Lisp

It's the kind of code that's a lot of fun to write when you first learn Clojure and not as much fun to read when you return to it a year later.

Could you be more specific about how you'd improve it?

Back when he did this, I scanned a lot of the submissions for the more esoteric languages, and many of them seemed like they were written by someone who "learned" the language in a weekend or two.