Related Clues:

• 'Well, of course!'
• 'No shit, Sherlock'
• First and eighth note in tonic sol-fa
• A word from Homer
• Response to the obvious
• 'I shoulda known that!'
• Moron's comment
• Utterance after spilling a Duff beer
• Homer call?
• Cry heard at Moe's bar
• Musical note (Var.)
• Dunderhead's 'oops'
• Line from Homer
• "Am I an idiot!" to Homer
• 'That's obvious, stupid!'