Triskaidekaphobia

Many individuals, cultures and religions object or have objected to Friday or to the number 13. Christianity objects equally to both. Friday is frowned upon because Christ was crucified on a Friday, and 13 is disliked in accordance with the number of men attending the Last Supper. The fear of a day or number may invoke inaction or paranoia in the life of an individual.

A 1986 survey reveals 41% of people in the UK feel uncomfortable about Friday the 13th, while 4% live in absolute dread of its arrival.