We're hard-wired for Lisp. Broca's area 44,45 and 47 are responsible for processing hierarchical structures.[1] That's why it's so easy to reason about Lisp code.
[1] http://www.letras.ufrj.br/poslinguistica/recursion/papers/17...
[1] http://www.letras.ufrj.br/poslinguistica/recursion/papers/17...