[suryabeep]

There is a section in 'In the First Circle' by Solzhenitsyn where two prisoners argue about the etymology of 'fun' in Russian. I don't remember the quote off the top of my head right now, but one prisoner posed that'fun is derived from the word for "temporary lack of worry"'. Of course, the other prisoner disagreed with him so I don't know if that etymology is actually correct.