In our session it has become "traditional" to sing South Australia, with the verse:

"There ain't but one thing grieves my mind, It's to leave Miss Nancy Blair's behind."

Once, Carolan's "Planxty George Brabazon" (click here for a midi) went on a bit too long, and the singers started in (in serious 3-part harmony) with: "This is the song that never ends, it never ends, it never, never ends..."