Related Clues:

• ''Amazing!''
• 'Oh'
• Visionary's words
• 'Understood'
• 'How about that!'
• ''I didn't know that''
• Shrink rap?
• ''I'm impressed!''
• Word said while scratching the head
• ''--- whillikers!''
• What a nod may mean
• 'What a surprise!'
• 'Hmmm ...'
• ''Ah, gotcha!''
• 'Mm-hmm'