Scheme & Lisp
The Lisp paradigm, compared to other kinds of programming languages, embodies some of the most beautiful and insightful ideas I've ever come across. Common Lisp is all too clumsy for my taste, so I prefer the slightly more elegant language Scheme. Credit where credit's due, though; much of Scheme's beauty is inherited from Lisp.
How about Lisp - The Movie?
The Game Of Life in Scheme, implemented as a function that accepts a life board as a parameter, and whose return value is a new life board describing the next generation. This was my first Scheme program, apart from playing around with "Hello World" and its kin.
Femton - a Swedish program (in Scheme) which will reveal to you a Great Truth about the mystical number 15.
Lisp Is Self-Permeating.
-- Linus Akesson