It's bad luck to leave a house through a different door than the one used to come into it.
143
An acorn should be carried to bring luck and ensure a long life.
115
Once a wedding ring has been placed on the finger, it is considered bad luck to remove it.
117
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
If you catch a falling leaf on the first day of autumn you will not catch a cold all winter.
394
Many believe that if all of the candles on a birthday cake are blown out with one breath, while making a silent wish, the wish will come true.
298
Collect seven or nine different flowers on midsummer eve and place them under your pillow and it is said that you will dream of your future spouse. (Sweden)
463
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