I raised a similar question a few years back, when I was helping my girlfriend to research rugby songs. We know that many secular tunes were adopted by the church. We also know that many hymns have been burlesqued as rugby songs. I have long wondered if there is a tune, which began life as a secular song, became a hymn and then was reclaimed as a bawdy anthem by rugby players. The idea seems plausible, but I have yet to come up with a concrete example.