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I know somebody who used to assist an exorcist for the Catholic Church. This person is very close to me. They have told me stories that are undeniably supernatural.

I also had a coworker, a very honest and good man. He and his wife witnessed a hairbrush fly across their room and hit a wall after she voiced that she thought their home was haunted. That hairbrush is why they sold that house.

Both sources described incidents with multiple witnesses that defied physical explanations. I trust both sources.

From what I can tell, the location matters. Certain elements and rituals can trigger responses. Other than that, I don't know anything.