Many years ago, not long after passing my driving test, I was giving a lift to my mother to her friend's. On the dual carriageway I overtook a car driven by an old bloke, who evidently seemed to think that I had cut in front of him too sharply (I hadn't). He tailed me through every back street and by road till I reached my destination, all the time visible in my rear mirror. When I eventuallt stopped he got out and berated me for cutting him up. By this time I was thoroughly fed up and told him to Eff off. His reply was, "Charming! What would your mother think if she heard you talking like that?" I answered, "Just a minute," opened the car door and pretended to speak to my mother, closed it again and said, "She says you can eff off as well!"