Geek humor. Gotta love it.
But something a true Unix geek would understand.
I don't know if you've been on the geek humor threads here, but they're good and cover the spectrum. We apparently have a good number of true geeks on FR.
"God is real, unless declared integer."
"There are 10 kinds of people in the world. Those who know binary and those who don't."
"There's no place like 127.0.0.1."
I'll add an extra UNIX-specific one just for you. Ask your shell a question, get an answer (you'll have be in csh or tcsh on your Mac for it to work):
% If I had a ( for every $ Congress spent, what would I have?
Too many ('s.