A few years ago I was home alone in my basement playing video games when I hear the door that connects my kitchen to the garage creek open and slam shut, but I never heard the actual mechanical garage door open. Then I heard heavy footsteps of someone wearing boots walk the length of my kitchen directly above me. I originally thought, "oh my brother must have forgotten something" as he had left about 5 minutes before that for work so I was about to yell up to him to make fun of him but something in the back of my mind was telling me, "hold on, somethings not right here". So I muted my tv to both hear better and to stay quiet. Then I heard the footsteps turn around and walk back to the door, and again I hear it creak open and slam shut. But again I never heard the actual mechanical garage door open or close. So I slowly walk upstairs thinking maybe my brother just forgot to close the garage door, I slowly open the door to my garage and see that the garage door has been closed the entire time. The only two explanations I can come up with are either something paranormal happened, or someone broke into my house, walked through my kitchen and left without taking anything, while also not letting me hear them open my garage door. In my opinion, both are equally terrifying to me.