As much as I love a good Greenspun invocation, I don't think this really counts:
> Any sufficiently complicated C or Fortran program contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp.
isn't about the inevitability of literally implementing a Lisp interpreter.
It's about something more abstract. see: http://c2.com/cgi-bin/wiki?LevelsOfGreenspunning