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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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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In Asia, the digit 4 never appears in any Nokia handset model number, because 4 is considered unlucky in many parts of Southeast/East Asia.
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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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Amber beads, worn as a necklace, can protect against illness or cure colds.
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Placing a hat on the bed is, apparently, bad luck. (South Carolina)
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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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According to an age old custom, carrying a dead shrew in your pocket wards off rheumatism!
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