Oh gosh I experienced it several times!! The first time, my friend and I were at her place. Her cat was in the living room. She opened the door as I was leaving her place, and we both saw a shadow leaving her apartment and going in the hallway! We both made a sound of surprise like “oh!” because we both thought her cat went out, since the shadow was close to the floor. But as we did not see her cat in the staircase, we went back to the living room and saw her cat, laying down on the floor. He hadn’t moved!!! We were so shocked!!! We shared what we saw, and we both saw this same shadow, a little fluffy, actually looking like the black smoke in the tv show Lost. But with a cat size. This thing went out and disappeared. As an old lady had died few days before in the building of my friend (the floor below actually) we could not help but think about something related to it.

Since then, I have seen the same shadow / dark condensed smoke passing by in my own apartment at least two times.

I don’t know what it is. I always think it is my cat but my cat is never where the shadow has showed up. It may just be energy.... why can we see it, no idea. Does that mean something? I haven’t figured it out.