Related Clues:

• Sarcastic reply to an assurance
• 'That'll be the day!'
• "Baloney!"
• 'Like that's gonna happen!'
• Doubter's scoff
• "Yeah, right"
• “Yeah, right”
• "Fat chance!"
• "No way!"
• "Don't think so"
• 'You don't say'
• "No kidding!"
• 'Like that'll ever happen!'
• Skeptic's retort
• Cynical snort