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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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 a hat on the bed is, apparently, bad luck. (South Carolina)
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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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Some motorcycle enthusiasts hang a biker's bell from a portion of their bike to protect themselves from evil road spirits.
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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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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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