Related Clues:

• This puzzle's theme, succinctly
• ''Be serious!''
• 'Be serious!'
• Face facts, slangily
• 'Quit dreaming'
• 'You've got to be kidding!'
• ''Gimme a break!''
• "You can't be serious!"
• "Oh, be serious!"
• Inducement
• ''I don't buy that!''
• "Seriously!"
• "Puh-leeeze!"
• 'You have got to be kidding!'
• 'Don't be ridiculous!'