This line was trickier. Taken at face value, it seemed to say that the key was hidden in a tomb somewhere, one filled with horrifying stuff. But then, during the course of my research, I discovered an old Dungeons & Dragons supplement called Tomb of Horrors , which had been published in 1978. From the moment I saw the title, I was certain the second line of the Limerick was a reference to it. Halliday and Morrow had played Advanced Dungeons & Dragons all through high school, along with several other pen-and-paper role-playing games, like GURPS, Champions, Car Wars, and Rolemaster.