Placing keys on a table is considered unlucky. (Sweden)
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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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It's bad luck to leave a house through a different door than the one used to come into it.
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An acorn at the window will keep lightning out
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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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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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Pirates believed that piercing the ears with such precious metals as silver and gold improved one's eyesight.
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Placing a hat on the bed is, apparently, bad luck. (South Carolina)
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