Ding Dong Ditch?

So something a little odd happened this morning. We were sitting downstairs on the couch, just enjoying the morning, and we hear the doorbell ring. I glance out the window and I see a little old Japanese lady walking away. We go to the front door but she is long gone. We look around, check the inside of the mailbox, thinking maybe she dropped something off. There wasn't anything anywhere. No idea what that was about. Oh well!