Related Clues:

• Bagel center
• Fitting conclusion?
• ''That's incredible''
• Awed one's remark
• Plowman's command
• '___ whillikers!'
• "Color me surprised!"
• Keep mum after green light produced surprise!
• "Hmm, I didn't know that!"
• Head scratcher's remark
• "No kidding"
• "__ honest ..."
• "I don't know" lead-in
• "Gee whiz"
• Crikey!