Weird shrugging/should roll thing

My 18 month old is doing this weird thing. I am trying to get a video of it to send his doctor but I keep missing it. He is like kind of shrugging and rolling his shoulder and tilting his head to his ear. Kind of like others has an itch. I’m freaking out because he was doing it the other night, now he’s doing it again. Has anyone’s baby ever done this before???