Possible Clues:

• Group's response to ''Who's there?''
• ''Here we are!''
• Doorbell ringers' response
• "Here we are!"
• “We’re here!”
• “Who’s there?” answer, perhaps
• ''We're here!''
• 'Who's there?' response from a couple
• "Who's there?" response from a couple
• Chorused "Who's there?" response