An acorn at the window will keep lightning out
93
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
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
It's bad luck to leave a house through a different door than the one used to come into it.
143
Once a wedding ring has been placed on the finger, it is considered bad luck to remove it.
117
Two people breaking a wishbone is said to lead to good luck for the person with the larger piece.
225
Some motorcycle enthusiasts hang a biker's bell from a portion of their bike to protect themselves from evil road spirits.
64
Before traveling a person should, apparently, sit on their luggage. (Russian)
117