There are numerous sailors' superstitions, such as: it is considered bad luck for a ship to set sail on a Friday, to bring anything blue aboard, to stick a knife into the deck, to leave a hatch cover upside-down, to say "pig", or to eat walnuts aboard.
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Placing a hat on the bed is, apparently, bad luck. (South Carolina)
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It's bad luck to leave a house through a different door than the one used to come into it.
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Before traveling a person should, apparently, sit on their luggage. (Russian)
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An acorn should be carried to bring luck and ensure a long life.
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According to an age old custom, carrying a dead shrew in your pocket wards off rheumatism!
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Placing keys on a table is considered unlucky. (Sweden)
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When you speak of bad luck, it is said that one should always knock on wood. Also knocking when speaking of good luck apparently helps with having good luck. This is an old Celtic tradition related to belief of wood spirits.
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