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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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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If you catch a falling leaf on the first day of autumn you will not catch a cold all winter.
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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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An acorn at the window will keep lightning out
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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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If one walks underneath an open ladder it is said to bring bad luck. Sometimes it is said that this can be undone by immediately walking backwards back underneath the ladder.
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Before traveling a person should, apparently, sit on their luggage. (Russian)
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