There's a little boy in my hometown that I babysit when I go home for breaks. He's a really sweet kid, always smiling and singing himself to sleep. At night when he goes to bed, I turn on the baby monitor to watch from downstairs.
One night I was curled up on the couch and I checked the monitor. My finger slipped and the monitor switched to the second camera, which was wired to the basement. This happened routinely, so I wasn't concerned, until I noticed what looked like a man standing in the basement.
I freaked out and ran to the top of the basement steps. I flipped on the lights and checked the monitor again. The man was gone. Just to be sure, I went downstairs and looked around, but there was no one there.
I assumed that it was just my imagination.
I left the lights on and went back to the couch. Everything was fine for another half hour or so, until I heard the baby wake up. I checked the baby monitor again. The figure from the basement was standing in the baby's room. The baby was singing to himself and staring at him.
I completely freaked out and ran upstairs. When I opened the door, there was no one there, but the baby was wide awake and smiling as always. He stood up when I walked in, so I rocked him for a while, put him back in his crib, and waited in his room until his parents got home.
I haven't seen the man in the monitor since. Every time I babysit for him, I'm terrified that the man will reappear.