Smiley face
Note: This trick requires After Dark v4.0. Go to Messages 4.0. Select "Style" and choose "Foggy Screen". Go to "Custom" and type [Space]. The hand should draw a smiley face.
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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".