I have no idea if this is true or not, but I read it on a blog somewhere and I just thought it was funny.
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, fucking stop it then!”