The king of Belgium is fed up that the Dutch make jokes about how dumb Belgians are. He goes to King Willem, of the Netherlands, and demands that the Dutch should do something stupid, so that the Belgians can laugh at the Dutch. Willem wants to maintain good relations so he says; "meh, we will build a bridge in the Sahara". The king of Belgium approves and so it happens; the Dutch build a bridge in the desert.
They became the laughing stock of the world. The king of Belgium is pleased and says to king Willem:"Ha ha that was funny, you can remove the bridge.
King Willem responds: "We can't, there are Belgians on the bridge trying to fish."