Related Clues:

• 'Boy, am I dumb!'
• "How could I be so stupid?"
• "How obvious!"
• 'Isn't that obvious?'
• 'Isn't that obvious?'
• 'Well, that's obvious!'
• Bonehead's response
• 'Well, ___!'
• 'How obvious!'
• ''Obviously!''
• ''Well, that's obvious!''
• Stupid response
• Snerd word
• Forehead slapper's exclamation
• "I'm not stupid, y'know"