At the Boy Scout Camp that I work at, one of the major traditions is that after the major campfires on Monday and Friday nights, when all the scouts have gone to bed, the staff stays at the campfire stage and sings all the songs that we can't sing around the scouts. Usually this consists of songs like "The Gambler", "Piano Man", "Rollin' On The River", and "The Sloop John B.". But one night, we were all standing around and one of those long silences that happen when no one knows what to sing next hit and instead of killing the staff sing like those silences usually do, someone started softly singing "Down In The River To Pray". Gradually those of us who knew it (almost entirely because of O Brother) including myself joined in, followed by the ones that didn't know as they picked up the pattern. Eventually we had the entire Camp Wolfeboro Staff singing it!
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You know, just once I'd like to meet an alien menace that wasn't immune to bullets. - Lethbridge-Stewart, (Doctor Who TV series)