Related Clues:

• 'That'll be the day!'
• "Get out of town!"
• Flat turndown
• 'Like that's gonna happen!'
• "Oh, you wish!"
• "Yeah, right"
• 'Clueless' expletive
• "Yeah, like that'll ever happen"
• Never!
• "Fat chance!"
• "Impossible!" and the theme of this puzzle
• "No way!"
• "You gotta be kidding!"
• "I don't think so!"
• Adamant denial