It's Halloween, and you and your friends got lost in the middle of a mirror maze. You turn multiple corners, trying to find the exit before you go insane... when you realize your friends are gone. It's silent.
You nervously traverse through the reflective halls of the mirror maze, gazing into the tinted purple mirrors and seeing your reflection in all of them, trying to find an exit or at least another person. But after a bit of walking, something in the mirror catches your eye; your reflection isn't you. It's another person in the mirror's reflective purple glare.
Out of mere curiosity, you press a hand up against the mirror to see if it's real or just your mind playing funky tricks on you. The reflection presses its hand up against the mirror as well... before their foot kicks out and sends you flying backwards, the reflection quickly jumping out of the mirror and materializing itself into existence, a wide grin on their face.
Themself: "GYAHAHAHAH!!"