What's considered rude that travelers do in Berlin?

Blocking the left lane of escalators is the fastest way to earn open contempt from Berliners — stand right, walk left, no exceptions, and this applies everywhere from U-Bahn stations to the airport. Beyond that, speaking loudly on public transit marks you immediately as a tourist; the city runs on a low-key, don't-perform-yourself-in-public social code that visitors often misread as unfriendliness. Tipping poorly or skipping it entirely at sit-down restaurants is noticed — 10 percent is the floor, and you hand it directly to the server rather than leaving it on the table. Jaywalking when children are present will get you verbally corrected by strangers, since Berliners take the social contract around Ampelmännchen seriously. Finally, treating Mitte like the whole city and ignoring Neukölln, Prenzlauer Berg, or Friedrichshain while asking locals for "authentic" recommendations comes across as lazy and a little insulting to a place with a genuinely complex geography.

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• Where do locals actually go for aperitivo in Berlin?
• Where do locals drink coffee in Berlin?
• What does a local breakfast look like in Berlin?
• Where is the street food in Berlin actually good?
• Where can I eat after midnight in Berlin?
• How do I get from the airport to the city in Berlin?