100 Oddities for a Dungeon

From the introduction:

Welcome to “100 Oddities for a Dungeon,” the sixteenth entry in Skirmisher Publishing’s popular and bestselling line of system-free sourcebooks designed to make any areas or encounters taking place in them more fun and interesting! This supplement is dedicated to dungeons in the classic sense of places used to confine and punish people, including prisons, jails, oubliettes, and torture chambers;