Related Clues:

• "When donkeys fly!"
• 'Not in this lifetime!'
• "No chance!"
• "Not in this lifetime!"
• 'Not gonna happen'
• "Not in a million years!"
• Part 2 of today's quote
• Alternative for now
• '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''
• Under no circumstances
• At no time whatever
• Word heard before and after "say"
• That's more what you'd expect to be 6 across by a raven