re: Germany for work and vacation

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Do they have any unique customs?

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If you are invited to anyone's home, take your shoes off at the door. There will usually be a mat or area like a mud room for said shoes.
Bring a gift for the host or hostess. Flowers or imported wine are good choices.
Be punctual.
Don't jay walk. It is considered bad form.
Do NOT walk in the bike lane. You WILL get run over.
Don't ask an opinion if you don't want a brutally honest answer. Many, if not most will be completely honest with you and tell you that yes that shirt does indeed make you look fat.
As another has said, do not use a first name unless prompted to do so.
That lady sitting at the toilet door is not just there to say hi. She/he expecting a tip for keeping the loo clean. Usually .50 to 1 euro.
Chit chat and small talk just wastes everyone's time and is generally not done.
DO eat Brotchen with every meal.( This is more of a personal thing for ma as I miss that crusty little roll from heaven like the flowers miss the sunshine. )