I believe profanity is a common in most likely most source code. I
have had the opportunity to examine extensive amounts of source code
from Atari and it is filled with profanity, poems,
quotes, jokes and
inside-jokes...
I think its a way of blowing off steam for programmers and quite frankly
it adds a more personal touch to code to see that it wasn't just written
by a bunch of drones, but from creative, feeling people with a sense of
humor.
Curt