Possible Clues:

• ''That couldn't happen!''
• "It can't be!"
• Leader of revolution has abandoned country? You're kidding!
• 22 across observing king's abdication? Don't hold your breath!
• 'You must be dreaming'
• "Get out of town!"
• 'Zero chance!'
• 'That's impossible!'
• Run out of Scandinavian country? In your dreams!
• "Get outta here!"