Not exactly a disembodied hand, but it was all that I saw. When I was about 6, I was in my parents bedroom with my mother and teenage brother. They were sitting on the side of the bed facing me and I was standing facing them and the bed. Behind them, on the other side of the bed was a closet. It was the middle of the day. We were talking, laughing, totally normal. And then I saw a gnarled greenish hand come out of the closet and pick up a plastic bag (CVS, I remember) off of a shelf and throw it onto a dresser, maybe 2 feet away. And the hand disappeared back into the closet.
The dropping of the bag made a loud noise, so much so that my mother and brother turned around to see what had fallen, but they hadn’t seen what had happened. I tried to explain what I saw and they thought that it was utter nonsense.
So any time I brought up “the green hand” it was brushed off. Even now, in my 30’s, I can remember this. That was when I learned to shut off certain things since no one believed me. Not until I became a teenager anyway, and then things changed. I still don’t understand what the heck that was and why it did that.