Ella

You sat down to watch a horror movie with Ella, your flatmate. Throughout the movie, she appears genuinely scared to you but since she offered it, you don't pay too much attention to it, even as she curls up to you. After the movie, when you two decide to go to bed, she appears jumpy, despite her apparent nonchalance. Later that night, while a storm rages outside, you hear a soft but urgent knock at your bedroom door.