# Clojure + Common Lisp, 29 bytes

    (print(if '()"trick""treat"))

Clojure version on ideone: https://ideone.com/8yvxxU

Common Lisp: https://ideone.com/IWsU6X

In Common Lisp `nil` is the same as `'()` and thus `'()` evaluates to `false` whereas in Clojure empty list is not `nil` and thus is `true`. I hope its being not a full program but a snippet(?) is fine for the challenge.