June 24

1374 – A sudden outbreak of 'St. John's Dance' causes people in the streets of Aachen, Germany, to experience hallucinations and begin to jump and twitch uncontrollably until they collapse from exhaustion.
1938 – A meteorite lands in Pennsylvania, United States, estimated to have weighed 450 metric tons when it hit the atmosphere and exploded.

1947 – Kenneth Arnold makes the first widely reported UFO sighting near Mount Rainier, Washington.

• The pilot claimed to see a string of nine, shiny unidentified flying objects flying past Mount Rainier at speeds he estimated to be at least 1,200 miles an hour (1,932 km/hr).