Let's have some fun and grep the linux source code (linux-3.0.y) for bad words :-)

$grep -i -r -B 2 -A 2 fuck *

...

drivers/ide/cmd640.c- *  of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
drivers/ide/cmd640.c- *
drivers/ide/cmd640.c: *  These chips are basically fucked by design, and getting this driver
drivers/ide/cmd640.c- *  to work on every motherboard design that uses this screwed chip seems
drivers/ide/cmd640.c- *  bloody well impossible.  However, we're still trying.

...

lib/vsprintf.c-/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
lib/vsprintf.c-/*
lib/vsprintf.c: * Wirzenius wrote this portably, Torvalds fucked it up :-)
lib/vsprintf.c- */