Some people on the internet think that Selena's knees look like the face of a baby.
But it's pretty clear to me that it's actually DEMONS that live inside her knees.
Sometimes the knee-demons are happy!
Sometimes they're indifferent.
But most of the time they're not happy at all.
Sometimes, only one of the knee-demons come out.
But know this: knee-demons appear most often while Selena's performing.