Girl Smashes The Hell Outta Her Own Face
Take notice of the bookshelf/door (or whatever it is), and the shadow it casts on the wall (over the right shoulder). At the start of the video, the shadow is fuzzy, but by the end of the video, the shadow edge is quite crisp. This would suggest a considerable difference in lighting conditions between the start and end of the video, which is not something that can be accounted for over a short period of a few seconds. It's a clever and superficially convincing special effect.