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2. Never read aloud from a spell or magic book unless you know what it does. Even if you're not sure if you believe in magic, if someone tells you it's magic or if it's labeled as such, don't do it!
3. Similarly, don't put on, or sometimes even touch, a piece of jewelry unless you know where it came from. In theory any item can work I guess, but jewelry seems the most popular choice for this, maybe because it's something most people are attracted to right away. Anymore you can think of?