Related Clues:

• "No way!"
• Dismissive remark
• "Don't you wish!"
• Skeptical comment
• ''Get real!''
• 'Oh yeah, that'll happen!'
• 'Stop dreaming!'
• 'Ain't gonna happen'
• This puzzle's theme, succinctly
• ''Be serious!''
• 'Be serious!'
• Face facts, slangily
• 'Quit dreaming'
• "You wish!"
• "You can't be serious!"