Yes, two things. For me, I have had bouts of head jerking tics caused by anxiety and muscle tension. I told my close friend about this and it got him worried about some head jerking that he had experienced. He loves to see horror movies and to be scared by them. He says he frequently sees 'jump scares" and jerks his head back or to the side very quickly like he is trying to dodge something (you know how horror movies scare everyone). I didn't think much about my head jerking until he started to get worried too.