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 is bad luck to put new shoes on a bed (or a table) (comes from the tradition of dressing a corpse in new clothes and shoes and laying them out so everyone can give their respects) - (UK)
57
It's bad luck to leave a house through a different door than the one used to come into it.
143
In some parts of England, rum is used to wash a baby's head for good luck.
71
An acorn should be carried to bring luck and ensure a long life.
115
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.
78
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