Pirates believed that piercing the ears with such precious metals as silver and gold improved one's eyesight.
131
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.
208
Placing keys on a table is considered unlucky. (Sweden)
3
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
Once a wedding ring has been placed on the finger, it is considered bad luck to remove it.
117
Collect seven or nine different flowers on midsummer eve and place them under your pillow and it is said that you will dream of your future spouse. (Sweden)
463
Placing a hat on the bed is, apparently, bad luck. (South Carolina)
9
Before traveling a person should, apparently, sit on their luggage. (Russian)
117