Nelson Mandela is sitting at home in Qunu, his feet up on a stool, watching Orkney Snork Nie on TV when he hears a knock at the door. When he opens it, he is confronted by a Japanese man clutching a clipboard and yelling: "You sign! You sign!"

Behind him is an enormous 18-wheeler truck full of car exhausts. Nelson is standing there in complete amazement when the Japanese man starts to yell louder: "You sign! You sign!"

The ex-president, cool, calm and collected as always, says to him: "Errrrr, I'm sorry, you've obviously got the wrong man," greets him and shuts the door.

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

Mandela is getting a bit hacked off by now, so he shoves the man back. "Errr, look, I've already told you, you've got the wrong person! I don't want them!" then slams the door in his face again.

The following day he is resting and late in the afternoon hears a knock on the door once more. He opens it and (you guessed) the little Japanese man thrusts the same clipboard under his nose, shouting: "You sign, you sign!" Behind him are TWO large trucks full of car parts.

Nelson loses his cool completely, picks the man up by his shirt and yells at him: "Look, I don't want these! Do you understand? You must have the wrong name! Who are you looking for?"

The Japanese man looks at him a bit puzzled, consults his clipboard, and says: "You not Nissan main dealer?"