After Dark Codes -

Swimming toaster:
Note: This trick requires After Dark v4.0. Select the fish screen saver. Press [Caps Lock] after the screen saver activates. A flying toaster will eventually swim across the screen after the fish swim away.

Scared fish:
Note: This trick requires After Dark v4.0. Select the fish screen saver. Press [Tab] after the screen saver activates to scare away the fish.

Alternate colors and backgrounds:
Note: This trick requires After Dark v4.0. Press [Caps Lock] after one of the following screen savers activates: "Super Guy", "Hula Twins", "Out 'n About", "Bad Dog", "Swirling Magic", "Mandlebrot", "Satori", "Nirvana", or "Tunnel".

Rock Scissors Paper battle:
Note: This trick requires After Dark v4.0. Select the "Rock, Paper, Scissors" screen saver. Press [Caps Lock] to display an option that allows you to select the rock, paper, or scissors in a game against the CPU.

Santa Claus:
Note: This trick requires Totally Twisted After Dark. Set the system date to December 25. Select the "Voyeur" screen saver. Santa Claus will eventually fly by in the background.