1977, August 9: The Officer and the Dancers
Police Officer David Swift was on patrol near Stonebridge Avenue in Kingston-Upon-Hull, England, around 1:30 in the morning on August 9, 1977, when he saw a thick fog on one of the playing fields and decided to investigate, in case it was smoke. As he walked towards the patch of fog he saw three people dancing in it, and became suspicious he might have some drunks to deal with. As he got closer he could see it was a man and two women; the man was wearing a sleeveless jerkin and tight fitting trousers, and the women wore bonnets, shawls, and white colored dresses. All three were dancing as if around a non-existant maypole, each with one arm raised in the air. Swift was just 15 meters (about 45 feet) away from the trio when... they vanished. Shaken by the suddeness of this event, Swift ran back to his car and drove up and down the road until he was able to calm back down.
While many books and magazines have listed this occurrence as an example of fairies, ghosts, or aliens, for the most part they are all just copying each other. I have three sources however that claim the original report for this event is from the August 10, 1977, edition of the Hull Daily Mail from England. I am trying to track down a copy of this article to confirm it from the original source, but for now have marked it as 'Unreliable.'