Last week, because of a combination of bad planning (my bad) and endless delays (Deutsche Bahn’s bad), I arrive very late in a hotel in Berlin. I had to ring the doorbell. The guy at the reception started giggling the moment I came in, which irritated me at first (did my hair look so funny, after all these hours on the train?). But he quickly reassured me that it wasn’t about me. It was about the fact that he had pressed the button for the daily closing of the system about ten seconds before ...

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