Related Clues:

• "Of course!"
• 'Boy, am I dumb!'
• "How could I be so stupid?"
• Nonchalant syllables
• "How obvious!"
• 'Isn't that obvious?'
• "Son of a gun!"
• 'Would you look at that?!'
• "Fancy that!"
• 'You don't say'
• 'Isn't that obvious?'
• 'Well, that's obvious!'
• Bonehead's response
• 'How obvious!'
• ''Obviously!''