This joke is older than Bono: Change Bono with Teacher.
Not that I care for Bono and U2 is a horrid band, but this is a total urban legend.
U2 were playing in Glasgow many years ago. In between numbers Bono started clapping his hands slowly and shouted out in his over-emphasized Northern Irish brogue: "Every time I clap my hands a child dies" Immediately the response came from the audience: "Well stop f***ing clapping then". Love that.

