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.
It's bad luck to leave a house through a different door than the one used to come into it.
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.
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.
Breaking a mirror is said to bring bad luck for 7 years. To "undo" this, take the shards of glass and bury them underneath the moonlight. In ancient times, the mirror was said to be a window to the viewer's soul. If that mirror were to break, it would
An acorn at the window will keep lightning out
Once a wedding ring has been placed on the finger, it is considered bad luck to remove it.
Two people breaking a wishbone is said to lead to good luck for the person with the larger piece.