Unknown Horrors

Publisher's blurb:

Unknown Horrors contains nine sets of tables, each intended to let Game Masters randomly generate the key elements of a tale of terror—in which the player characters will face ghosts, swamp monsters, serial killers... and worse! These outlines can then be fleshed out into adventures for monster-mauling heroes.

All that's required to use this product are, the ability to take notes, an imaginative GM, and players wanting to bring their characters face-to-face with nightmares made real.

Unknown Horrors is a universal game supplement, and, although written with a modern setting in mind, most of the plots are easily transferrable to other times and worlds.