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In page Nisse (folklore):

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Observance of traditions is thought to be important to the nisse, as they do not like changes in the way things are done at their farms. They are also easily offended by rudeness; farm workers swearing, urinating in the barns, or not treating the creatures well can frequently lead to a sound thrashing by the tomte/nisse. If anyone spills something on the floor in the nisse's house, it is considered proper to shout a warning to the tomte below.[citation needed]