Related Clues:

• ''What have we here?!''
• Charlie Chan's un-P.C. exclamation
• "I got it!"
• 'I get it,' jokily
• "Now I remember!"
• ''Bingo!''
• "Well, looky here!"
• Facetious ''I see!''
• "I caught you!"
• Gotcha!
• Light-bulb moment word
• 'Totally!'
• "Understood"
• "That's it!"
• Sound of a light bulb going on?