The Seaford Poltergeist Case is a famous case of poltergeist activity which drew a lot of attention from the media at the time, as investigators tried to solve the mystery and offered various theories. The article notes how poltergeist cases are often centered around teenage children, typically girls. However, the Seaford Case is different, as the poltergeist activity in the Herrmann household is suspected by some to center around the son. One theory for poltergeist activity is that sexual energies of a pubescent individual are externalized through vibrations. Both this and the association between poltergeists and teenage children, particularly girls, were informed by sex and gender norms and beliefs at the time. Another theory suggests that poltergeists are an external manifestation of internal struggles, and another attributes the activity at the Herrmann house to the physical force of vibrations from something such as a jet plane being transmitted through water underneath the house.
“Mystery in L.I. House Deepens; Family, Experts, Police Stumped,” Milton Bracker, Special to The New York Times. March 3, 1958, Folder “Seaford Poltergeist,” Box D, Eileen J. Garrett Parapsychology Foundation Collection, Collection 331, Special Collections, University of Maryland, Baltimore County (Baltimore, MD).