In my distant past I had the pleasure to guide a group of former geology students of Leiden University to the Eifel volcanoes. All wealthy people working for Royal Dutch Shell. It was a dying out club even then as there is no geology department in Leiden for years. But I had the pleasure to be introduced to Orange Bitter, as it was Koninginnedag one of the days of the tour. We all stood up, of course, to congratulate !