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This is known as "the Ghostbuster Ruling" and was determined in a 1991 when the US Supreme Court determined that a house that the owner had previously advertised to the public as being a "haunted house" was legally haunted for the purpose of an action of recission brought by a subsequent purchaser of the house.
We don't have anything exactly like this in Canada, though it's never a bad idea to disclose if strange happenings have been occurring around your house 
