I have a friend whose cat recently died. It was a black Persian. Sweet kitty. Loved everyone.
The other night I went to this friend's house, and as I sat on the sofa, I noticed a strange impression about the size of that cat in the cushion furthest from me. I also could swear I could see the outline of a cat's front leg and rear leg pressed into the cushion. I have to note that these cushions are fairly stiff and not really malleable enough for an object to make more than a general indentation in one of them. There's no way if you set something down on one of the cushions would you be able to tell what object had been left there upon removing it. The cushion would simply return to its original shape, as evidenced by my not leaving an impression of my butt every time I stood up.
At the same time I saw this impression in the cushion, every time I turned away slightly I could swear I saw a black cat out of the corner of my eye.
I did not say anything to that friend at the time.
Fast forward to last night. The friend's internet wasn't working so she came over to my house to use the WiFi. During our conversation she mentioned she had been seeing her dead cat around her house!
I must have sank back in my chair as I told her my experience.
Take it for what you will.