I lived here with my partner and two other roommates, nothing super weird ever happened here until this experience. The way our unit was set up, we were on the top level of the two level, and our door didn’t have a peep hole but it had a window on the left side so you can see when people walk down the stairs on our side. It had a kitchen window so you could see who was at the door, as well as see anyone walking across the walkway to other units. My partner was at work and one of the roommates was off doing whatever so it was me and my roommate “A”. We were just hanging out I think cleaning or cooking and we get a knock on the door. Immediately we look at each other which a nervous confused face. I had a very odd feeling. Both of us are very antisocial and didn’t really ever have people over. Neither of us were expecting anyone. I look out the kitchen window to see who it is, wondering if it was the tamale lady stopping by randomly. It wasn’t. There was a hunched over old lady doing a very weird wiggle/shimmy thing while bending over. I normally don’t get the creeps but it made me filled with anxiety. Here’s where it gets extra weird. Because of the layout of our unit, we can see if someone is leaving from both sides. Whether they walk down the stairs to the left, or walk across to the other side of the stairs to the right. “A” was looking out on the left, I was looking on the right to see them leave and who they were. We never saw them leave. We never heard footsteps walking away. The only other way for someone to leave without being seen would be to hop over the railing down to the ground which I don’t see an old lady doing. After we determined the coast was clear to check and see if anything was left on our door, we open it and nothing was left, nothing was out of place. To this day I still do not know what knocked on our door but I’m glad “A” was there to experience it too so I know someone believed me.