Related Clues:

• "You don't say!"
• Forehead-slapper's cry
• "Of course!"
• 'Boy, am I dumb!'
• "How could I be so stupid?"
• "How obvious!"
• 'Isn't that obvious?'
• 'Yeah, you're right'
• "No kidding!"
• 'Isn't that obvious?'
• 'Seriously!'
• 'That's not news!'
• 'Well, that's obvious!'
• Bonehead's response
• 'Well, ___!'