Behind You borrows from films like The Exorcist, Child’s Play, Signs, and even Beetlejuice, yet it also presents something unique: as far as I can tell, it's the first horror film where peanut butter is used to ward off an evil spirit. That’s a distinction that might be positive or negative, but it's certainly unusual. Olivia (Addy Miller) and Claire (Elizabeth Birkner) are two young sisters who have recently lost…