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
Placing keys on a table is considered unlucky. (Sweden)
3
A single magpie is considered a sign of bad luck. A Guide to the Scientific Knowledge of Things Familiar recites an old proverb concerning the incidence of bad weather when magpies forage alone and a possible scientific explanation for this.
49
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
Once a wedding ring has been placed on the finger, it is considered bad luck to remove it.
117
Placing a hat on the bed is, apparently, bad luck. (South Carolina)
9
An acorn should be carried to bring luck and ensure a long life.
115