I was probably in fifth grade, and my friends were describing how you would go into the bathroom, and turning off the lights – and this was on the playground at my elementary school – that you’d close your eyes, turn around three times and say “Blood Mary, Bloody Mary, Bloody Mary,” and when you open your eyes you’re supposed to see Blood Mary in the mirror. And the lore was someone’s cousin did it, and Bloody Mary came out of the mirror and killed him. My brother had nightmares for years around that stuff, because he heard the same stuff.
I heard this growing up as well, around third grade from a friend. I remember it very distinctly as well, because it was so scary at the time. I never wanted to be in a bathroom with the lights off, fearing Bloody Mary would appear even if I didn’t do the ritual.