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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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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According to an age old custom, carrying a dead shrew in your pocket wards off rheumatism!
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There are numerous sailors' superstitions, such as: it is considered bad luck for a ship to set sail on a Friday, to bring anything blue aboard, to stick a knife into the deck, to leave a hatch cover upside-down, to say "pig", or to eat walnuts aboard.
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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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If you catch a falling leaf on the first day of autumn you will not catch a cold all winter.
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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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Placing a hat on the bed is, apparently, bad luck. (South Carolina)
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