Compared to other recent Lisp posts, this one implements the nitty-gritty like garbage collection itself, not depending so much on the implementation language.
"Ich bins" with the 's' actually does mean "It's me" in German (I'm told). Manuel Simoni pointed out the pun when he saw an earlier attempt called 'icbins'.
Syntax highlighting. Github thinks it's Scheme when it's really its own dialect of Lisp, with \c for a character literal instead of #\c. (Part of the fanatical simplification.)