Poultry culled in Hong Kong over bird flu fears

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What is the significance of the phrase 'What's the?' in communication?

How can the phrase 'What's the?' be interpreted in different contexts?

In what situations might someone use the phrase 'What's the?'

What emotions might be conveyed by asking 'What's the?'

Can 'What's the?' be used effectively in written communication? Why or why not?