What You Don't Know About Mary Kate And Ashley Olsen's Birthday

On June 13, 1986, Mary-Kate and Ashley Olsen entered the world. Six months after the fraternal twins were born, they landed the role of Michelle Tanner on the ABC sitcom "Full House" (via Screen Rant). When the first episode of the series aired in September 1987 (via Cinema Blend), the girls were pretty close to their first birthday.

Out of the entire "Full House" cast, Michelle was often a fan favorite, thanks to Mary-Kate and Ashley's joint performance as the youngest Tanner. Despite not returning for Netflix's 2016 reboot "Fuller House" (via Cheat Sheet), their role as Michelle in the original series will forever stand out as a reason it worked so well.

Playing the character for eight years straight, the duo must have spent a lot of birthdays on set with the rest of the cast and crew. But there's one thing you might not know about their birthday, which fell on a pretty ominous day.

That's because the day they were born in 1987 just so happened to fall on a Friday, and since their birthdate was June 13 — well, you can see where this is going. Yep, the Olsen twins are among the handful of actresses who were born on Friday the 13th (via L'Officiel), joining the likes of Kat Dennings, Kate Walsh, Lili Reinhart, and Julia Louis-Dreyfus.

But why is the date so unlucky? The superstition stems mainly from various religions and beliefs, according to CNN Style. According to that report, Judas was the 13th guest at the Last Supper in the Bible, the one who would betray Jesus, which would lead to Jesus' crucifixion, which itself just so happened to fall on a Friday. In Norse mythology, the unlucky number relates to the god of mischief, Loki — specifically, when he interrupted a gathering of the Gods in Valhalla, making the number of those at the dinner add up to 13. He then tricked the blind god Hodr to shoot and kill his brother Balder with a poisoned arrow.

Although the date is widely considered bleak and unlucky, the history surrounding Friday the 13th isn't actually all that bad. As HuffPost writes, the number is lucky in many cultures. In Egypt, the number represents the stage at which you pass on to eternal life, and in ancient Israel, it's considered a "sanctified" number. And as for Friday, the day is actually named after goddesses in numerous cultures, with names including Freya and Frig. So maybe Friday the 13th isn't such a bad day to be born on after all.