The first episode of the popular TV series 'The Office' (U.S.) aired on May 31, 2005, eventually becoming a cultural phenomenon and gaining a dedicated fanbase.

On May 31, 1969, the first successful manned mission to the Moon, Apollo 10, was launched, paving the way for the historic Apollo 11 landing.

The Johnstown Flood occurred on May 31, 1889, when the South Fork Dam failed, killing over 2,200 people and becoming one of the deadliest disasters in U.S. history.