was babysitting my niece once while I was staying at my brother's place, and they had the baby camera setup so I could see her on the little TV it came with. I was studying and started dozing off when I heard some whispering and realized it was coming from the monitor.
I initially thought it was some feedback or something, but when I looked at the TV there was a dark shadow near my niece's crib. I have never been more terrified in my life, but the shadow was clearly there where it had not been before. I ran to my niece's room and looked around and saw nothing, but I took her the hell out of there. I went back to the TV, and the shadow was clearly gone.
I told my brother what happened and he pulled me aside and told me not to mention it to my sister-in-law because she'll freak out, but that he had seen that same thing several times now, with the same whispering.
They stayed in that house for about four more years and when my niece was just learning to talk she would tell her mom about her 'special friend.' To this day, it scares the shit out of me. When they moved out, my brother told me my niece had become inconsolably sad because she would miss her 'friend.' Her mom would tell her she could bring him along but all she would say was that he couldn't leave the house. We have never to this day told her about that damn shadow, and she apparently never saw it.