Yup. That is how I got attacked by black magic. I went to a psychic for a reading and she gave me a crystal as a 'gift' to take home. A few days later I watched in horror as a demon literally crawled out of the crystal and attacked me. I contacted the psychic and after MUCH back and forth, she basically wanted me to pay her large sums of money to remove the curse she put on me. Then she sent more demons to attack me. Now I am possessed and my life is a living nightmare. Once I brought that crystal into my house it opened up a doorway to let more through. Be very careful who you trust and what you bring into your home.