If you catch a falling leaf on the first day of autumn you will not catch a cold all winter.
394
Once a wedding ring has been placed on the finger, it is considered bad luck to remove it.
117
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
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
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
Some motorcycle enthusiasts hang a biker's bell from a portion of their bike to protect themselves from evil road spirits.
64
Amber beads, worn as a necklace, can protect against illness or cure colds.
89