Another parting song we sometimes sang if the gig was in a pub was to the tune of "Bread of Heaven" and went something like this:

Don't forget your empty glasses
Bring your glasses to the bar.
Empty glasses, empty glasses,
Bring your glasses to the bar
Bring your glasses to the bar.

Imagine now everyone had their own personal harmony lines and each tried to out-sing the next person. It was all a ploy on our part to be allowed to sing one more encore - the bar-staff didn't mind too much so long as all the empties were cleared away first so they could get on with washing up whilst we were still warbling away. Aaah those were the days.