Especially if you speak Norwegian.
Norwegians will assume you know all the unwritten laws and failure to obey them will lead to social punishment.
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This is one of the 100 Unwritten Norwegian Social Laws presented in our new book "The 100 Unwritten Norwegian Social Laws"
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Read more about our amazing Norwegian friends in our other Guidebooks to Norway written by Julien S. Bourrelle and Sean Percival.