19 Reasons Why Friday the 13th Still Scares Us

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1.13th guest at Last Supper

Judas, the apostle who betrayed Jesus, was the 13th guest at the Last Supper.

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2. Crucifixion on Friday

In Christian tradition, Jesus was crucified on a Friday, which by that time was the day criminals were hanged, so Friday was considered a day of dread. Christian culture would in time combine the number 13 with Friday as an unlucky day.

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3. 13 is an incomplete number

In numerology, 12 is considered a complete number — 12 apostles, 12 major Greek gods, 12 hours in half a day, 12 inches in a foot, 12 jurors — whereas 13 is not.

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4. Eve tempted Adam on a Friday

In biblical tradition, Eve tempted Adam with the forbidden fruit on a Friday.

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5. Cain killed Abel on a Friday

Another Bible tradition holds that Cain murdered Abel on a Friday.