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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If you catch a falling leaf on the first day of autumn you will not catch a cold all winter.
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Before traveling a person should, apparently, sit on their luggage. (Russian)
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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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Pirates believed that piercing the ears with such precious metals as silver and gold improved one's eyesight.
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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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Two people breaking a wishbone is said to lead to good luck for the person with the larger piece.
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Placing keys on a table is considered unlucky. (Sweden)
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