It's bad luck to leave a house through a different door than the one used to come into it.
143
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
An acorn at the window will keep lightning out
93
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
Opening an umbrella indoors is said to result in 21 days of bad luck. Some traditions hold that it is only bad luck if the umbrella is placed over the head of someone while indoors.
75
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
An acorn should be carried to bring luck and ensure a long life.
115