Walking under a ladder is supposed to be bad luck, and it is if a tool falls on your head or if you dislocate the ladder and the person on the ladder falls down.
If a black cat crosses your path, it is a sign of bad luck, the person should go the other way to avoid bad luck.
An upright horse-shoe nailed to a gate post is supposed to be lucky.
Spilling salt is unlucky, and if you do spill salt, you are supposed to get some of the spilled salt and throw it over your left shoulder.
Sweeping dust out of the house on New Years Day is unlucky as it is throwing your money away.
Eating certain foods on New Years day is supposed to bring health, wealth, and good fortune.
On your wedding day wear something borrowed, something blue, something old and something new.
Predicting the gender of a baby was done by suspending the wedding ring over the belly of the pregnant woman. If it swung in a circle, the baby was a girl, if in a vertical line, the baby was a boy. This worked for all three of my kids. Hmmm...maybe there is something to this?
If you hear an owl hoot, someone will die.
Knock on wood 3 times if you say something positive so as not to jinx yourself.