Allen Falkner likes to tickle his students with thoughts of trauma. "Somebody's skin is going to tear tomorrow," he said. "Hopefully." Falkner, the "Father of Modern Suspension," had gathered 15 students in the back of a San Jose tattoo parlor for a four-day class titled the Art of Human Suspension. The curriculum attracted a lawyer from San Diego, an IT guy from Silicon Valley, two journalists from Mexico City, a state employee from Nebraska and a truck driver from Pennsylvania. For $600 a pop, students were taught how to hang a human body from steel fish hooks, the kind...