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
It's bad luck to leave a house through a different door than the one used to come into it.
143
An acorn should be carried to bring luck and ensure a long life.
115
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
According to an age old custom, carrying a dead shrew in your pocket wards off rheumatism!
24
Before traveling a person should, apparently, sit on their luggage. (Russian)
117
Two people breaking a wishbone is said to lead to good luck for the person with the larger piece.
225
Placing a hat on the bed is, apparently, bad luck. (South Carolina)
9