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Lesson Transcript

Friday the 13th
Did you know it's believed in the U.S., that if a Friday falls on the 13th day of any month, that it's considered an unlucky day?
The origins of this superstition aren't clear. It's possible that since some Christians believe 13 is an unlucky number and Friday is an unlucky day, Friday the 13th is especially unlucky.
There is even a famous horror movie created after this superstition called Friday the 13th.
The number 13 is already an unlucky number, but Friday the 13th is an especially unlucky, creepy day.
Knock on wood
In the U.S., it's believed that knocking on wood after talking about the future can prevent an event that was spoken about from taking place or to ensure that it will indeed happen.
It's probably because in many cultures, it's believed spirits live in trees. Knocking on wood is a way to avoid tempting fate: You knock on wood to remind yourself that the future is still uncertain.
I had a great job interview and knock on wood, I think I might be in the running.