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 Dr. Barry Taff, formerly with UCLA's parapsychology lab and principal investigator of the now famous "Entity" case has stated that this could very well be the "granddaddy of all hauntings" at least from the perspective of visual evidence captured on both video and film photographs. 
A full extended book version of the case by Dr. Taff, "Aliens above, Ghosts below" is available at: 

http://www.netbooks.com/catalog/taff/index.html
In 1989, a small group of paranormal researchers investigated a woman's claim that her small San Pedro home was haunted. What followed turned out to be one of the most bizarre, true hauntings on record - all documented on videotape by a professional cameraman.
 Strange flying balls of light!
Human blood plasma dripping from  walls! 
 Apparition seen in various places
An attempted hanging of a photographer! 
As seen on TV shows:
Joan Rivers Show, Vicki Lawrence Show, Suzanne Summers Show
Hard Copy, A Current Affair, The Other Side, Strange Universe,
American Journal, The Extraordinary, Judge for Yourself.