Nelson Mandela is at home watching TV when there is a knock at the door.

It's a Japanese delivery-man clutching a clipboard, pointing to a truck
full of car exhausts in the driveway, and yelling: "You sign. You sign."

The bewildered president will do no such thing and slams the door.

The next
day, the man is back, waving a clipboard under the great man's nose,
gesturing to a truckload of brake pads and insisting: "You sign! You sign!"

Nelson gets rid of the man again, but next day he's back with two
truckloads of car parts, once again insisting that the president sign for
the goods.

Mandela loses his temper and yells: "Look, I don't want these! Do you
understand? You have the wrong name."

Puzzled, the Japanese man consults his clipboard and asks:
"You not Nissan Maindealer?"