Folk og røvere i Kardemomme by

I just came across a wonderful children's book in Norwegian from the 1950's. Folk og røvere i Kardemomme by by  Thorbjørn Egner.  It's a fictional town where there is only one law: Kardemommeloven (The Cardamom Act). 

The law is simple:

Man skal ikke plage andre,

(One should not bother others,)

man skal være grei og snill,

(you should be nice and kind,)

og for øvrig kan man gjøre hva man vil.

(and otherwise you can do whatever you want.)

It's now a famous expression in Norway.  I love it.