Possible Clues:

• Happy cry from someone who finally deciphers a Magic Eye picture
• "Ooh! There!"
• Spotter’s declaration
• Reply to a back-seat driver's warning
• "They DO look alike"
• 'Yeah, that seems plausible'
• 'They DO look alike'
• "No need to point"
• 'No need to point'
• Cry of discovery