The Corries a 60s/70s Scottish folk duo (one half of whom died last year)used to finish with one of two very short encores that they introduced straight-faced. The first "for the older members of our folk audience" went: Granny's in the cellar I'm surprised ye canna smell 'er Baking biscuits on a damned old dirty stove In her eye there is some matter That keeps drippin' in the batter And when she breathes in the (snorting sound effect)runs through her nose.

The other was introduced as a tribute to a young girl they'd met: On the bosum of sweet Abigail Was written the price of her tail And on her behind For the use of the blind Was the same information in Braille.

All in the best possible taste of course!