Possible Clues:

• "Funny you mention it ..."
• "Since you mentioned it ..."
• 'Since you mentioned it . . .'
• 'Ah, yes, I'd been meaning to tell you ...'
• Intro to a reluctant comment
• 'Yeah...well...'
• 'I meant to tell you ...'
• 'Since you asked ...'
• 'Since you mentioned it ...'
• 'Er, yeah, regarding what happened ...'