Okay kiddo, have you ever heard of a scary story called "Bloody Mary"? It's not a real person, but sort of like a spooky legend that some people believe in.
The story goes like this: if you go into a dark bathroom alone, and say "Bloody Mary" three times into the mirror, she will appear and maybe even hurt you!
But why is she called Bloody Mary? Well, some people think it's because there was a real person named Queen Mary I who was known for being very strict and even killed some people who didn't believe in her religion. Others think it's just a made-up name to scare kids.
Either way, it's just a spooky story and not something you need to be too worried about. Just remember to always be safe and not play around in dark, creepy places!