Half way through a U2 concert, a single spotlight illuminates Bono on an otherwise empty stage.
He walks slowly but deliberately to the front and asks the audience for some quiet.
Then, as the noise of the crowd quickly dissipates, he starts to slowly clap his hands.
Holding the audience in total silence, he says into the microphone... "Every time I clap my hands, a child in Africa dies."
A voice from near the front suddenly pierces the silence... "Well den ya dozy Oirish eejut, stop feckin' clappin' den."