A lorry driver stops at a red light and a blonde catches up to him. She knocks on the window and says, “You are losing some of your load.” The driver thinks she's a nutter and ignores her, the lights change, and he proceeds down the street. At the next light, the blonde again catches up and says, “you are losing some of your load.” He ignores her again and continues down the street. At the next red light the blonde catches up, all out of breath, knocks on the window and says, “you are losing some of your load.” The lorry driver looks at her and finally he says, “It's snowing and I’m driving a gritter.”