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.
105
The superstitious symbolism of a black cat crossing one's path is dependent upon culture: some cultures consider this a sign of impending bad luck, while some cultures consider this a sign of impending good luck.
75
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
Once a wedding ring has been placed on the finger, it is considered bad luck to remove it.
117
In some parts of England, rum is used to wash a baby's head for good luck.
71
Placing a hat on the bed is, apparently, bad luck. (South Carolina)
9
Amber beads, worn as a necklace, can protect against illness or cure colds.
89
It's bad luck to leave a house through a different door than the one used to come into it.
143