Possible Clues:

• 'Thank you, Captain Obvious'
• "Thank you, Captain Obvious"
• "What else could it be?!"
• 'How did I miss that!'
• Something said with a slap
• 'It's so obvious'
• 'Oh, of course!'
• 'Obvs!'
• "That's obvious!"
• 'It was right in front of me all along!'