Teen wolf

Two young men stand in a dimly lit room, one with a crumpled paper bag over his head, then the other removes it, revealing a shocked expression. The scene cuts to a group of people in a dark hallway, where one man is lifted and carried by another, followed by a close-up of a man with a grotesque, monstrous face giving a thumbs-up, and finally a close-up of a young man winking and smiling.