Related Clues:

• 'When pigs fly!'
• See 50-Across
• Bird call
• Taunt
• 'That'll show you!'
• 'Forget it!'
• 'I doubt that!'
• Holler's partner
• Sound from the bleachers
• 'Yeah, sure!'
• Scrooge's cry
• 'So there!'
• Riot
• Heckle, in a way
• Greet the villain