Obscurity factor: 8
Thanks to Lee Kay from Chicago for bringing this one to my attention. Little Nicky and his mother (Anna Strasburg) leave the big city for a new home in the country. They buy one that is rumored to be haunted and upon moving in meet the witch that haunts the place (Hermione Gingold). They relegate her to the attic while they try and make the home pleasant. She becomes depressed and one day Nicky tries to cheer her up. He discovers she used to cook for the other witches that lived in the house, so he asks her to cook for them. She makes blueberry pancakes, but not just ordinary blueberry pancakes - these pancakes make people happy. When Nicky's mother tastes them, she decides to open a pancake parlor.
This film, which was narrated by Burgess Meridith, was recently written up in the NY Times. It has developed the kind of cult following that has made it a legend. It was made by Parent's Magazine and distributed through schools, to be shown at assemblies and when rain kept the children in during recess. It was lost to the sands of time until the internet came along. Hundreds of people were finally vindicated in their memories of this odd little film that none of their friends remembered. Here's a link to the New York Times article.
Obscurity factor: 8 (almost completely forgotten until it was featured in the times, available on DVD)