When I was at school a medical meant that we all had to stand in a line in only our underpants and go up to the doctor one at a time. The doctor was usually assisted by nurse in starched white. One time the kid in front of me had a huge erection that stood straight out in his underpants, when he got to the front the doctor said to drop his pants and the wayward penis shot straight out, before the doctor could say "cough" the nurse reached up to her breast pocket, took out a pencil and in one arching movement twanged the poor kids willy. The suddenness with which the willy went flaccid was scary me and the other boys in the line checked to see if we were suitably relaxed.