You ought to see the infamous "Deaf and dumb Choral society" do this one in the Barn at Towersey, Very irreverent but hysterically funny if your sense of humour runs that way. The gesture for some of the words are almost as infamous as those for the signed version of "Swing low,Sweet chariot" at England rugby football games. A group of 3 or more can completly "corpse" a singer if it is unexpected, so only do it to people you are CERTAIN has a sense of humour.I am afraid we are a bunch of pisstakers in the Barn especially on the Monday night(after all the people who have work next day have gone) of the Festival when poor old Tony has to keep the diehards under control.