Related Clues:

• 'I don't know' lead-in
• "Imagine that!"
• ''I'll be a monkey's uncle!''
• ''___ willikers!''
• “Holy cow!”
• "No fooling!"
• ''Hmm, I don't know''
• ''I hadn't thought of that''
• '-- whiz!'
• Grand opening?
• "I didn't know that!"
• Wally's exclamation
• "Aw, heck!"
• Naive expression of wonder
• "My stars!"