It's bad to fake having a medical condition.
Arthur's son had a wheel chair, but he was at the doctor and had left his spare chair at home.
Arthur wants to pick his son up form the doctor.
Arthur parks in the back and walks his way up to the front.
Arthur sits in his son's chair, so he can park up front when picking his son up.
Arthur has no issues picking up his son from the doctor's.
Arthur gets stuck in the chair since it's too far small for him.