Are there any superstitions you find interesting or believe in?

Did you know these happy cookies have a darker story? Superstitions about the gingerbread flourished in the 17th century. Witches supposedly made gingerbread cookies, ate them, and thereby caused the death of their enemy. Dutch magistrates went so far as to declare baking or eating molded cookies illegal.
Are there any superstitions you find interesting or believe in?
Are there any superstitions you find interesting or believe in?
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