r/AskReddit; What Is the Creepiest Thing That Has Ever Happened to You?
Reddit Explains Conspiracy & the Unknown - A podcast by Pop Media Agency

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We read a few comments including a man that checked the video image of his camera to check on his child while the child slept, but saw an empty crib. Instead of waking up his wife, who was asleep next to him, he turned up the volume only to hear another woman’s voice singing a lullaby to the child.