Another Creepy Moment

Okay, so I'm making a salad in the kitchen. I hear something that sounds like pieces of tin hitting each other. It was weird. I looked outside to see if they were working on the road or something similar. Nope, not happening. It did sound like it was coming from inside the house. Every time I went to investigate it stopped. Hmm. Then later, my dog and I were on my bed. I hear someone call my name. It was from the side door. My dog heard it, too, as he lifted his head as if to listen. I went down figuring it was a friend or someone. There was no one there, but the door was open. Freeeaaakkkyyy.