Pennywise

A young boy in a hooded sweatshirt looks down with a fearful expression under red lighting, then the scene cuts to a boy in a white t-shirt with a shocked expression in a red-lit room, followed by a clown with white face paint and a red smile attacking a person in a dimly lit room, then a group of children walking down a suburban street during the day, then a group of clown figures in a dark, red-lit room, and finally a close-up of a child's face being held by an adult.