4:3 Military plane crashes in Yemen, kills at least 9

What do you think the phrase 'What?' signifies in a conversation?

In what contexts might someone use the word 'What?'

How does the use of 'What?' affect the tone of a conversation?

Can you provide an example of a situation where 'What?' could be misinterpreted?

What emotions might be conveyed by the exclamation 'What?' in different scenarios?