Possible Clues:

• Attention-seeking utterance
• 'Um, excuse me'
• “Uh, excuse me...”
• Start of a break-in?
• Sound of a break-in?
• [Cough cough]
• "Attention, please!"
• 'Beg pardon . . .'
• 'Did you forget about me?'
• ''Sorry to intrude . . .''