Related Clues:

• "No kidding"
• "I don't know" lead-in
• Turn signal, on a horse
• "___-whiz!"
• 'No kiddin'!'
• "Who knew?"
• 'Didn't know that!'
• Haw's mate
• Command to 62-Down
• ___-whiz
• 'That's interesting!'
• "That's interesting!"
• "Whiz" opener
• Beaver Cleaver exclamation
• Expression of surprise, seeing horse? Not half