When I turn the lights off

The gif lagged with me so her hand just kept going back and forth

Creepiest one was when they showed the sister playing in her room with someone, but showing everyone else down the hall.

Yeeeeeesss O-O

Or when Jessica Chastain's character thinks it's the youngest sister hiding behind the chair but it's actually Mama who then disappears behind the closet!

And I can't forget when Mama killed the teacher, that was horrifying.

Well said.

Why did I get downvoted?