Related Clues:

• 'Imagine!'
• 'Oh, I don't know'
• 'Aw, shucks'
• 'I had no idea!'
• Intro to "you're swell"
• Ingenuous cry
• Start to whiz
• "My goodness"
• "Hmm ..."
• Horse command
• "I'm impressed"
• Head of government?
• "Gosh"
• 'Aw, --!'
• Thing that begins gradually?