Nelson Mandela is sitting at home watching the telly when he hears a knock at the door. 

When he opens it, he is confronted by a little Chinese man, clutching a clipboard and yelling: "You sign! You sign!". Behind him is an enormous truck full of car exhausts.

Nelson is standing there in complete amazement when the Chinese man starts to yell louder. "You sign! You sign!"

Nelson says to him, "Look mate, you've obviously got the wrong bloke. Now go away." -- and shuts the door in his face.

The next day he hears a knock at the door again. When he opens it, the little Chinese man is back, with a huge truck full of brake pads. He thrusts his clipboard under Nelson's nose, yelling: "You sign! You sign!" 

Mr Mandela is getting a bit hacked off by now, so he shoves the little Chinese man back, shouting: "Look, you've got the wrong bloke I don't want them!", then slams the door in his face again. 

The following day Nelson is resting, and late in the afternoon, hears a knock on the door again. Upon opening the door, the little Chinese man thrusts the same clipboard under his nose, shouting "You sign! You sign!". Behind him are TWO large trucks full of car windscreens.

Nelson loses his temper completely, picks the little man up by his shirt front and yells at him: "Look, I don't want these! Do you understand? You must have the wrong name! Why do you want to give these to me?" 

The little Chinese man looks at him a bit puzzled, consults his clipboard, and says: "You not Nissan Maindealer?"