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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The superstitious symbolism of a black cat crossing one's path is dependent upon culture: some cultures consider this a sign of impending bad luck, while some cultures consider this a sign of impending good luck.
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Once a wedding ring has been placed on the finger, it is considered bad luck to remove it.
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Placing keys on a table is considered unlucky. (Sweden)
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If you catch a falling leaf on the first day of autumn you will not catch a cold all winter.
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In some parts of England, rum is used to wash a baby's head for good luck.
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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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Placing a hat on the bed is, apparently, bad luck. (South Carolina)
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