Related Clues:

• "How dumb can I be!"
• 'I'm such a dope!'
• ''No kidding, stupid!''
• 'Isn't that obvious?!'
• "How silly of me!"
• "Like, how did I make THAT mistake?"
• ''I should've known that!''
• "Boy, am I dumb!"
• 'Well, how obvious!'
• 'That much was obvious'
• 'Well, yeah!'
• "Of course I knew that!"
• 'Everybody knows that!'
• 'That's, like, so obvious'
• ''No need to remind me''