Did Alex Wolff dislocate his jaw in Hereditary?
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Alex Wolff: 18 facts about the Hereditary actor you need to know

10. Did Alex Wolff dislocate his jaw in Hereditary?
While Alex Wolff didn’t dislocate his jaw in Hereditary’s classroom scene, he did sustain a pretty gnarly physical injury. Speaking to the Wrap, Alex said that he wanted to actually do it for real, but Ari Aster said no. A ‘soft cushion desk’ was brought in but it wasn’t as soft as Alex thought it would be. “I remember after, I was just panting, my voice is gone, blood is dripping down everywhere — real blood gushing down my knee because I slammed it against a chair. I couldn’t move my arm."