Possible Clues:

• 'I remember now!'
• 'That does sound familiar'
• 'But of course'
• 'It's all coming back to me now'
• "I remember it well"
• Words before "I remember it well," in a "Gigi" song
• “So I see”
• 'Now I see!'
• W.C. Fields assent
• 'I understand now'