You took a picture with the Head-Shot camera, more specifically the first picture with the Head-Shot camera. Now, every picture taken from the camera lets your head go over whoever took the picture, and you can control them

A woman named Harley bought the camera and took a picture with it...if only she knew what would happen...

— Oh boy! I can't wait to take my first picture on this camera!

Your head appears on her body and her old head is gone, and you can now control the body of Harley, just with your head