I got an idea for a mod:
The mod is activated only 3 times a game week.
The mod is activated 6 game hours (6 real life minutes), from 00:00 until 06:00.
It starts with a sirene like in the movie.
All the streets become empty, and foggy.
Black Romero cars appear and you can hear only the song "Dead Skin Mask" (i really think it fits awesome to this)
Grey Children, Dead Nurses and Pyramid heads and more appear.
When you enter a building, ANY building, you will enter a dark bathroom with alot of bugs and the janitor that is beeing punished an hanging corpses.