Lutefisk

In Norway, we have a community of people who prefer to use a version of Norwegian that looks very much like lutefisk: Dug up remains from the garbage heap of history and dressed up to look like a tradition. 

~ Erik Naggum

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I don't think you should joke about lutefisk unless you've actually eaten it. Given the lack of lutefisk jokes, I think this is the case most of the time.