Related Clues:

• ''It's so obvious!''
• Forehead-slapper's syllable
• 'Any idiot knows that!'
• ''Boy, am I stupid!''
• "Silly me!"
• 'Gee, ya think?'
• "What an idiot I am!"
• "Obviously!"
• ''Obviously, Einstein!''
• 'Oh, of course!'
• ''Well, isn't it obvious?!?''
• 'Oh, yeah, really?'
• 'Ob-vi-ous-ly!'
• "How could I miss that?!"
• "Everybody knows that!"