I recall a Beavis & Butthead mod for Doom that disappointed me by not having them chant "BREAKIN' THE LAW, BREAKIN' THE LAWWWWW" when you brought out and used the chainsaw.
It was from the bad old Usenet-via-dial-up-AOL days, so there very well could have been one out there. By the time I had a better pipe to the 'net, I wasn't playing Doom2 anymore.