"After Dark" by Berkeley Systems was a collection of screensavers for Macintosh and Windows from early 90s; "Flying Toasters" is probably the most famous and loved among them.
Using my very limited knowledge of C and X11 programming, I recreated it as a XScreensaver module for Linux.
Hope you find it useful or at least amusing!
There was an aquarium where the mafia would dump someone with cement shoes.
There was apartment buildings where you could see people in the windows.
I thought it was after dark sick and twisted screensaver?
EDIT: It was After Dark Totally Twisted screen savers
Toxic swamp - an aquarium with dead/mutant fish swimming
Flying Toilets - like flying toasters, but...
Voyeur - apartment building with silhouettes in the window
and many more
https://youtu.be/ZsKYXftB68M
An edition called After Dark Totally Twisted includes the more macabre modules, namely Bungee Roulette, Chameleon, Coming Soon!, Flying Toilets, FrankenScreen, Message Mayhem, Mike's So-called Life, Mime Hunt, Mowin' Boris, Phlegm Boy, Shock Clocks, Toxic Swamp, and Voyeur.
https://en.wikipedia.org/wiki/After_Dark_(software)