The Swedish king visits the city of Arboga and begins by welcoming the different distinguished guests. He finishes by welcoming the audience by saying “welcome citizens of Örebro”.
Because the King is flawless there was nothing else to do but switch names on the two cities. In 1985 Arboga became Örebro, and Örebro became Arboga.
After this speech every map maker in Sweden have been holding their breaths whenever the Swedish king is speaking in public.