Thomas Pynchon, Gravity's Rainbow page 296

The visitor who is willing to spend extravagant sums is rarely disappointed. Micro knows the secret doors to rock passages that lead through to Dora, the prison camp next to the Mittelwerke. Each member of the party is given his own electric lantern. There is hurried, basic instruction on what to do in case of any encounter with the dead. "Remember they were always on the defensive here. When the Americans liberated Dora, the prisoners who were still alive went on a rampage after the material--they looted, they ate and drank themselves sick. For others, Death came like the American Army, and liberated them spiritually. So they're apt to be on a spiritual rampage now. Guard your thoughts. Use the natural balance of your mind against them. They'll be coming at you off-balance, remember."