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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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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Opening an umbrella indoors is said to result in 21 days of bad luck. Some traditions hold that it is only bad luck if the umbrella is placed over the head of someone while indoors.
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Before traveling a person should, apparently, sit on their luggage. (Russian)
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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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An acorn at the window will keep lightning out
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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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According to an age old custom, carrying a dead shrew in your pocket wards off rheumatism!
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