Related Clues:

• #5 hit for Edwin McCain in 1998
• ''It's so obvious!''
• Forehead-slapper's syllable
• ''Well, __!''
• Taken-aback response
• "Can you beat that!"
• "Imagine that!"
• 'Any idiot knows that!'
• 'Well, -- darned!'
• "__ darned!"
• ''Boy, am I stupid!''
• "Silly me!"
• 'Well, that's obvious'
• 'Gee, ya think?'
• "What an idiot I am!"