The conclusion is similar to the Greenspun quote

"Any sufficiently complicated C or Fortran program contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp."

I've discovered that deploying this quote as a compliment to someone's ac hoc, informally-specified, bug-ridden, slow, half-of-Common-Lisp code, makes them increasingly nervous until you get to the punchline.