Bono's Moving Serenade of Warren Buffett [VIDEO]

When Bono, one of the greatest entertainers of modern times, presents an award, he does it in rock star style. And when Warren Buffett, one of the greatest philanthropists in human history, accepts one, he makes the crowd laugh, cry and think. The result, as seen Wednesday night at the second annual Forbes 400 Summit on Philanthropy, was a moment for the ages.