It is sometimes claimed that God created the world using Perl, but it's clear that censors have gotten to Rav XKCD's work -- most of it is correct, and then the final panel is grafted in by another hand. (Look at the art! The style has clearly changed!) We also see the the answer there relies on finding patterns in English, and surely that cannot be the language of Creation!
We have the testimony of Reb Kanefsky that the language of Creation was in fact LISP, but I'm looking for an earlier source. From where do we learn that the world was created using LISP?