Friday the 13th is considered by many to be an unlucky day. Here's the history behind why people are superstitious about the day.

Here's more about the origins and traditions of the supposedly unlucky yet somewhat common calendar date known as Friday the 13th.

The New-York Historical Society says the origin can be partially traced back to Jesus’ Last Supper. The story goes that 13 guests attended the Last Supper—Jesus Christ and his 12 apostles—and the next day, Good Friday, was the day of Jesus’ crucifixion.