Related Clues:

• Emphatic refusal
• 'Impossible'
• Quitter's cry
• 'No way'
• Terse refusal
• "When pigs fly!"
• 'You can't be serious!'
• Terse turndown to an invitation
• "Not a chance!"
• "Forget about it!"
• "Get out of town!"
• "In your dreams!"
• Never!
• "Fat chance!"
• "Impossible!" and the theme of this puzzle