Avoiding a faux pas in a German pub

This definitely applies to Bavaria: When you walk into a country pub/restaurant you will notice that although there are tablecloths/ cutlery on most of the tables, one biggish table will be bare. This is the Stammtisch, where the regulars sit. There is no restriction on sitting there, but we advise you not to sit there, even if the landlord/lady lets you. It is not done. You only sit there if you are invited.