$ brew install fortune
$ brew install cowsay
$ fortune | cowsay
 ----------------------------------------
/ Retirement means that when someone says 
| "Have a nice day", you actually have a  |
 shot at it.                             /
 -----------------------------------------
           ^__^
           (oo)-------
            (__)       )/
                ||----w |
                ||     ||

via Niklas Eire Granström

1: http://rocu.de/reading-prime-dot-rb-the-build-in-support-for-prime-numbers-in-ruby/#comment-1430174535