A quatrain, not a couplet, but no "inane" category is complete without it. The song (Teddy O'Neill) is an otherwise poignant and sorrowful lament of a young Irish colleen when her lover departs on an emigration ship. And THIS is the opening verse! (Dolores Keane very sensibly sings the second verse first and doctors these lines up a bit, so you don't tend to see them now in the lyrics sites - an excellent argument for the oral tradition if ever there was one.) You won't find this in the DigiTrad:

I've seen the old cabin he danced his wild jigs in
As neat a mud cabin as ever was seen
Considering 'twas used to keep poultry and pigs in
I'm sure it was always most elegant clean