Related Clues:

• "Really?"
• "C'mon, too easy!"
• Sarcastic retort
• 'Obviously!'
• ''How silly of me!''
• 'Well, obviously!'
• "What ___ now?"
• Start of a ''Superman'' query
• ''I should've thought of that!''
• "How dumb can I be!"
• Start of a 20 Questions question
• 'I'm such a dope!'
• ''No kidding, stupid!''
• 'Isn't that obvious?!'
• "How silly of me!"