The end of the Diesel Era saw a wonderful re-imagining of one of these spirits in the movie Harvey.
Starring James Stewart, Josephine Hull and Peggy Dow, Harvey may be one of James Stewart’s best movies. IMDb gives the following summary of the plot:
Due to his insistence that he has an invisible six foot-tall rabbit for a best friend, a whimsical middle-aged man is thought by his family to be insane - but he may be wiser than anyone knows.
So on this Midsummer’s Eve celebrate our own mischievous spirit and bring home a copy of Harvey.