Placing keys on a table is considered unlucky. (Sweden)
3
If you catch a falling leaf on the first day of autumn you will not catch a cold all winter.
394
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 at the window will keep lightning out
93
Placing a hat on the bed is, apparently, bad luck. (South Carolina)
9
It's bad luck to leave a house through a different door than the one used to come into it.
143
Two people breaking a wishbone is said to lead to good luck for the person with the larger piece.
225
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.
105