This is a video from the Prank Pirates in Japan of people coming in to get special effects makeup applied, then be confronted with a monster coming out of the mirror they were just looking at themselves in. It was decently executed, although one model is so engulfed in her smart phone that she never even looks up to see the monster. Like, the whole time. Most of my friends are like that -- constantly staring at their phones. I ask them why and they say it's because I'm boring because not only are they addicted to their phones, they're also @$$holes.
Keep going for the video, then turn off the lights in your bathroom and spin in circles saying Bloody Mary until you get dizzy and fall in the bathtub.