Enjoy your meal
When you sit down to eat in the German-speaking part of Switzerland, do not start eating your food until you have said, "En Guete" to everyone you’re sitting with (even if you don’t know them—table sharing is common in tiny Switzerland). “En Guete” means "Bon Appétit" in Swiss German. Even if you are eating a picnic by yourself in the middle of a meadow, chances are someone will bike by and yell an "en guete" at you. They are just wishing you a nice meal. And if you're passing someone who's eating, you should return the favor.