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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Pirates believed that piercing the ears with such precious metals as silver and gold improved one's eyesight.
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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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Two people breaking a wishbone is said to lead to good luck for the person with the larger piece.
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Amber beads, worn as a necklace, can protect against illness or cure colds.
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According to an age old custom, carrying a dead shrew in your pocket wards off rheumatism!
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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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A single magpie is considered a sign of bad luck. A Guide to the Scientific Knowledge of Things Familiar recites an old proverb concerning the incidence of bad weather when magpies forage alone and a possible scientific explanation for this.
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