Child's Play

Why Chucky, why? Of all the movie characters for him to pick on, why did he choose Woody? (And most of the rest of the gang in subsequent posters.) Probably something to do with the fact that Toy Story 4 was being released to theaters on the same day. A great way of hinting at the monstrous things Chucky is capable of.

The Curse of La Llorona

The slightly eerie top image turns into a nightmare in the bottom image as the fate of the two children (and the face of the title character) is revealed.

It: Chapter Two

The eyes say it all. Just a glimpse of Pennywise is all that is needed to strike fear in your heart.

Midsommar

A lovely blue sky, a beautiful garland of flowers in her hair, but something is seriously wrong. The emotions on the woman's face make the tagline sound horribly ominous.

Us

A mask of happiness hides a terrible truth in this creepy design that offers only a subtle hint to the film's storyline.