I like this one "suck my balls" : http://www.google.com/codesearch?hl=en&lr=&q=%22suck+my+balls%22

"hope nobody sees this" – well, guess what? :) – http://www.google.com/codesearch?hl=en&lr=&q=%22hope+nobody+sees+this%22&btnG=Search

"no idea what this does" – http://www.google.com/codesearch?hl=en&lr=&q=%22no+idea+what+this+does%22&btnG=Search

"what the hell" – http://www.google.com/codesearch?hl=en&lr=&q=%22what+the+hell%22&btnG=Search

"intentional bug" –
http://www.google.com/codesearch?q=%22intentional+bug%22&btnG=Search&hl=en&lr=

DOOM: "hey, ron! can we say 'fuck' in the game?"
http://www.google.com/codesearch?q=can+we+say+fuck+in+the+game

FreeVMS: "this is fucking (can I say fucking in the kernel?) messy"
http://www.google.com/codesearch?q=%22can+i+say+fuck%22

original doom string comments... ;)
http://www.google.com/codesearch?q=show:nYIMdGA2yxc:kubwlFYDbms:WhjAbxNtVoY&sa=N&cd=18&ct=rc&cs_p=http://gentoo.osuosl.org/distfiles/prboom-2.4.4.tar.gz&cs_f=prboom-2.4.4/src/dstrings.c#a0

// Note that these ending "bad taste" strings were commented out
// in the original id code as the #else case of an #if 1
// Obviously they were internal playthings before the release of
// DOOM2 and were not intended for public use.
//
// Following messages commented out for now. Bad taste. // phares

sorry but I found this "fu ck usa"