Related Clues:

• 'Keep dreaming!'
• Old-style oath
• 'Don't even think about it!'
• 'Aw, quit your joshin'!'
• "It can't be!"
• 'Zero chance!'
• "Fiddlesticks"
• "Forget it!" (and a clue to this puzzle's theme)
• "Dream on!"
• "Poppycock!"
• 'Ain't happening'
• 'That's too hard to believe...'
• "That's too hard to believe..."
• 'You gotta be kidding me!'
• "Hogwash!"