Owning a Haunted House and being open every night of the year, people will tell me their "stories" about scary things happening from Oui-Ja board usage.
Right in my house, before I owned it using such a board might have stirred up something here which scared several people out of renting the apartment they had been living in. It may have continued for several years, being "The Voice" that scared my Ex away in that part of this house.
People's names would be called waking them up.
When I was in High School (1 million B.C.) I was at my girlfriend's family's house for a Christmas event. Her Cousin began playing with a Oui-Ja board all by herself infront of me. She asked the board:"Who will Diane Marry?" (Diane, my girlfriend)
Manipulating the board all by herself , "The Board" said "B-W".
"But my name is "Jim" (J-W)
But a few years later Diane did marry a man with those "B-W" initials. (They have been divorced now for 20 years?)
So, you never "Know?"