On May 20, 1967, a World War II veteran and amateur geologist walked toward an unknown craft sitting on a rock in the Canadian wilderness and shouted at the people inside in six different languages. What happened next left him with radiation symptoms, grid-patterned burns, and a 22-pound weight loss in a single week, and triggered a multi-agency investigation involving the RCMP, the Royal Canadian Air Force, and the U.S. government. The Falcon Lake Incident is Canada's most evidence-heavy UFO case, and more than fifty years later, nobody has been able to close it.