You can't get System Shock 1 music joke unless you was a 90' gamer. The point is in a music, that is cool but absolutely inappropriate for this game. The obvious one is Faidon-Doom song that I added for Stone Circle Ruins on Doom playlist in this build. I bet no one can fap while hearing that. :-D
I consider adding Doom marine sprite to somewhere in the game that would show up only if Doom playlist is selected. Alternative is Edward Diego sprite for System Shock playlist, but I doubt that anyone would get the joke.
That takes me back to guide dialog. I'm not sure what and in what form to put there because everyone takes everything too seriously today and everything is considered offending.