I've mentioned it before but never, never respond to a request for "Running Bear" in an Australian pub. Once they start adding "without his/her pants on after EVERY line you'll never be able to sing another song for the rest of the gig. They won't let you leave it alone!
Also "Five foot, six foot, seven foot BUNCH!" out of "Banana Boat Song" is always heard as very rude. It's the rhythm and the image it creates I reckon. Joy