In the final trailer for Paramount Pictures' Smile, the widest grins cut the deepest - The A.V. Club

At the onset of the trailer, Rose visits a male prison inmate who she believes might have the key to her unique problem, as he’s the only person who has seen this entity and lived.

Unfortunately, once the inmate realizes Rose has seen what he’s seen, his only answers for her involve screaming violently at Rose to get away from him.

Whatever malady Rose picked up is heavy on jump scares and light on boundaries; she begins to see the smile possess everyone from patients at her workplace to an entire group of children at a party.