Once a wedding ring has been placed on the finger, it is considered bad luck to remove it.
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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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Placing a hat on the bed is, apparently, bad luck. (South Carolina)
9
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.
70
An acorn should be carried to bring luck and ensure a long life.
115
At times, a horseshoe may be found above doorways. When positioned like a regular 'U' it supposedly collects luck. However, when it is positioned like an upside-down 'U' the luck supposedly drains.
78
Pirates believed that piercing the ears with such precious metals as silver and gold improved one's eyesight.
131
Before traveling a person should, apparently, sit on their luggage. (Russian)
117