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#1 Unlucky 13: This is probably the most common superstition there is known to man. It is manifested in movies, books and even in real life. You would notice that a lot of hospitals do not have the 13th floor in their elevators. It goes from 12th to 14th. This fear of 13 originates from the Bible where in Jesus’ last supper, there were only 12 guests until Lucifer came making him the 13th guest and the one to betray Jesus. Another is in norse mythology where a dinner by the gods are held with only 12 of them until Loki, the god of mischief, comes along making him the 13th guest before causing chaos. Maybe gamblers avoid betting on this number.
These superstitions are based on the culture that you grew up in.
For example, in Asian countries they treat the number 4 as the quoted 13. This is called tetraphobia, and I think it originated because of how close the word for 4 is to how you say "death".
It is so big that massive companies like Nokia would skip version 4 in their software for their Asian markets.
Also, some hotels with big numbers of Asian customers will skip the number 4 in the elevator.