You know you're a larper when you read this and immediately think "ooh, I bet that could be used in a game..."
"The thermal grill illusion (TGI) is one of the best-established laboratory methods for studying pain perception," Haggard explained. "In our version, the index and ring fingers are placed in warm water and the middle finger in cold water. This generates a paradoxical feeling that the middle finger is painfully hot." That's ideal because it allows scientists to study the experience of pain without actually causing any injury to those who participate in the studies.