I don't know whether this is true... but someone told it to me at the weekend and it made me laugh. Bono is at a U2 concert when he asks the audience for some quiet. Then in the silence, 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 pierces the silence... "Well, f***ing stop it then!"