Related Clues:

• Skeptic's comment
• 'Really?'
• 'Oh, really?'
• Skeptical response
• 'Oh, yeah?'
• 'For real?'
• 'You don't say'
• "No kidding!"
• Skeptic's retort
• "That's a lie!"
• Response to a dubious assertion
• ''Really?''
• 'On what authority?'
• "No kidding?"
• "Really?"