Knife Folklore Fragment of the Week:
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The accidental crossing of two case knives at the table must be avoided, as it is likely to cause a desperate fight between members of the family; if the knives are crossed inadvertently, they must be touched only by the same person who crossed them
Randolph, Vance. Ozark Magic and Folklore (formerly titled Ozark Superstitions). Dover Publications, Inc., New York: 1947. (p 58)
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