Don’t talk with your hands in your pockets in Germany
It’s considered bad manners. It’s also customary to keep your hands on the table while you’re eating.
Don’t tip in Japan
Service at restaurants and hotels will likely be exceptional in Japan, but tipping isn’t done; and it could be seen as degrading.
Don’t smile at strangers in Russia
They’ll see it as an intimate gesture, indicating a genuine affinity toward another person.
If you don’t know them, they might consider you insincere.