Related Clues:

• ''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'
• "It's pretty obvious, isn't it?"
• 'I am such a dope!'
• Head-slapping word
• ''How stupid of me!''
• 'It's so obvious!'
• "No __!"
• 'Obviously, Einstein!'