Related Clues:

• Word of disdain
• "Not in a million years!"
• Part 2 of today's quote
• "Like that's gonna happen!"
• "You wanna bet?"
• Alternative for now
• 'Pfft! Right!'
• Skeptical laugh
• Defiant shout
• 'Not a chance!'
• With 39-Across and 49-Across, rule broken by the three theme entries' first and last two letters
• Word seen on both sides of ''say''
• "Caught you!"
• Under no circumstances
• "You must be out of your mind!"