"Friday the 13th" happens just once or twice a year.
Exactly as rare as...
"Thursday the 12th" or "Saturday the 14th."
Or "Friday the 6th." Or "Friday the 20th." Or "Friday the 27th."
Me and 2 of my roommates just agreed that (if we even get married lol) we’re all getting married on back to back years on September 21st starting 2023-2025 just so we can rage to Earth, Wind, and Fire AND share anniversaries