Once my sister came to visit me in Texas and told me the creepy story of what happened to her.

Her husband and my sister had just had their first child a few months prior. My brother in law was working the graveyard shift at his job as my sister stayed home taking care of my nephew. Around 2 am, she heard loud knocking on her back door. She went to go check it out and saw a lady banging on the door asking for my sister to let her in.