Related Clues:

• Response to daredeviltry
• Circus sound
• 'How about that!'
• ''I didn't know that''
• ''I'm impressed!''
• [Gasp!]
• Word said while scratching the head
• Son of ___
• La la lead-in
• Mercury or Saturn
• ''--- whillikers!''
• Cry at a circus
• Sound of contentment
• 'What a surprise!'
• 'How exciting!'