The line in the Les Barker version is "Where's the Bathroom? On the Right" I think the set-up is that there's no light [so he can't see] and there's been an excess of curry [hence needing the bathroom].
"While Shepherds Washed Their Socks" is a parody, not a mondgereen.
From "Lucille" (Kenny Rogers): "with four hundred children and their crap in the field".
I heard a live Bluegrass band in the States singing, with a heavy southern accent, "I'm using my bible as a road-map", a song I'd never heard before. I thought it was "I'm using my bottle as a road-map" [a much more interesting concept, surely… ]