What sayings can be said to ward off bad luck?

To ward off bad luck, people often say phrases like "knock on wood" to avoid tempting fate, or "bless you" after someone sneezes, which is believed to protect against evil spirits. Other common sayings include "step on a crack, break your mother's back," which warns against stepping on cracks in the pavement, and "three on a match," suggesting that lighting three cigarettes from the same match brings misfortune. Additionally, some cultures might say "rabbit, rabbit" on the first day of the month for good luck.