One of the scariest elements to a thunderstorm can be the hail it might drop on your neighborhood. The biggest hailstone ever recorded in the U.S. came from a storm in South Dakota in July, 2010. It was 8 inches in diameter, weighed nearly 2 pounds, and had a circumference of 18.6 inches. Hail tends to do more property damage than killing, though deadly freak hailstorms have occurred throughout history. On a day that became known as "Black Monday" in 1360, a hail storm killed approximately 1,000 English soldiers near Paris during the Hundred Years' War. And in the 9th century, near the town of Roopkund, India, several hundred pilgrims were killed by a massive freak hailstorm.