quote:

What, he asked his Foreign Office escort, was that odd ‘oo, oo!’ noise coming from the back of the crowd? The diplomat explained that people were booing, an expression of disapproval. Khrushchev grew thoughtful. In the back of the car, he said experimentally to himself: ‘Boo!’ And then again: ‘Boo!’ He liked it. For the rest of the day, he went around exclaiming ‘Boo!’ to all kinds of puzzled people. He had learned something.