If you're afraid of Friday the 13th (the date, not the movie), you're in good company. There's a certain US president who shared your paraskevidekatriaphobia:
It's also the number that prompted FDR to alter his own travel plans on any day of the week that landed on the 13th.
"FDR would not depart on a (train) trip on the 13th," said Thomas Fernsler, a University of Delaware mathematician who has studied the number enough to earn the moniker "Dr. 13." He recounted a story that originated with FDR's personal secretary, Grace Tully, who said the former president would order the train to leave the station before midnight on the 12th or after midnight on the morning of the 14th.
In a final act, FDR died in 1945 on April 12. Thursday, April 12.
"He avoided traveling to the beyond on the 13th," joked Bob Clark, head archivist at the Franklin D. Roosevelt Presidential Library and Museum.
More about Friday the 13th phobia in this article by Don Babwin of AP: Link