Possible Clues:

• 'Well, how about that!'
• "I see what's going on!"
• Cry of clarity
• ''What a surprise!''
• "Eureka!" kin
• 'So that's your little game!'
• 'You can't fool me!'
• "Well, lookie here!"
• 'So that's what you're up to!'
• ''The plot thickens!''