A friend just sent me this one.
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Bono is at a U2 concert in Ireland 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 of the audience pierces the silence... "Fookin stop doing it then !"