Head and Shoulders

When BB was just beginning to feed herself, she had this annoying habit of touching the back of her head and neck with her dirty hands. Rice, sauces of every kind, anything that was on her hands would be in her hair, even when you were vigilant. Z's quirk is touching her right hand to that same shoulder and ear so that you're sure to find crumbs and gooey there at the end of the meal.