Great story. I enjoy interesting travel anecdotes like this. I used to have to visit clients in Sweden and Denmark. I have not done this in almost 15 years so the town names escape me, but there was a crossing of about 10 minutes journey on the ferry. People would get on to take advantage of the duty free, so there would be a mad rush as soon as the ferry was sufficiently out of port to open the doors. As soon as they reached the other side they would frequently take the ferry back.