Maybe it's someone at your front door..

I do have a funny story about that though. My step daughter's husband had to be out of town for a week at a training class so she didn't want to stay alone in their house. Her mom, who also lives alone said she could come and stay with her. So one evening, she called her mom and said she'd be over in awhile. When she arrived, the front door was locked ...so she rang the doorbell....no one came ...she rang it again......no one came so she rang it..rang it...rang it rang it...several times quickly..About then, her cell phone rang...she answered it. It was her frantic mother...saying,,,,"Someone is ringing my doorbell several times...What should I do?" My step daugher said,,,"It's me stupid, Open up the door"....LOL