“Get out now!” is not the answer. Generally,most people who come to find out that their house is haunted can live peacefully with whatever spirits are there. If it’s something that really, genuinely bothers you, say something as simple as “You need to leave.” To back up your statement, make it in the name of whatever it is you believe in most strongly. For some people, it’s Christianity. Putting that extra religious energy into your statement makes it more effective.
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Source: Reader’s Digest magazine, 7/6/21