Friday the 13th

The fear of Friday the 13th is called paraskavedekatriaphobia. More than 80 percent of high-rises lack a 13th floor. Many airports skip the 13th gate. Airplanes have no 13th aisle. Hospitals and hotels regularly have no room number 13. Many cities do not have a 13th Street or a 13th Avenue. Jack the Ripper, Charles Manson, Jeffrey Dahmer, Theodore Bundy and Albert De Salvo all have 13 letters in their names.