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.
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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
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
An acorn at the window will keep lightning out
93
It is bad luck to put new shoes on a bed (or a table) (comes from the tradition of dressing a corpse in new clothes and shoes and laying them out so everyone can give their respects) - (UK)
57
According to an age old custom, carrying a dead shrew in your pocket wards off rheumatism!
24
Pirates believed that piercing the ears with such precious metals as silver and gold improved one's eyesight.
132
An acorn should be carried to bring luck and ensure a long life.
115