I just heard this yesterday from someone who swears it is 100% truth because he was at the concert in Glasgow where it happened;
On stage, four numbers in and Bono has to try to save the world. So he starts clapping his hands slowly, and says:
"Every (clap) time (clap) I clap my hands(clap) a child (clap) dies in Africa (clap)
Member of the Audience shouts; "Well, stop clapping your hands, you f*****g eejit!"