Related Clues:

• ''When pigs fly!''
• Scornful laugh
• When pigs whistle
• 'Not in a million years!'
• Not in a million years
• Emphatic negative
• Not even once
• 'I bet!'
• 'Dream on!'
• "Told ya so!"
• ''That'll show 'em!''
• ''As if!''
• ''That's a funny one!''
• Shout of discovery
• 'Harrumph!'