Axe murder is genius (spoilers)

Marcie's death scene still to this day I find shockingly effective, largely because of the way it's edited:

You see the silhouette of the axe rise up behind her. She turns around, and we see it physically raised, and then come towards the camera. The camera zooms in on Marcie as she screams. The axe hits the lamp overhead, making the light flutter. There's then that iconic lingering shot of the lamp shaking, and it almost tricks you into thinking that's all you're going to see. You intuitively expect it to cut to the next scene—but it doesn't.

There's then the loud, jolt-inducing musical cue as she collapses agains the shower stall, her eye fluttering, with an axe split through half her face.

It's honestly is one of the most grotesque axe murder scenes I've seen on film, and one of the most effective. I can only imagine the reaction it got from audiences in 1980. Even today, you don't really expect to see it like you do. It's a fantastic moment in a great film.