One time, at my in-laws' house, my husband's mom was saying how recently she had been hearing this low moaning sound every once in a while coming from somewhere in the living room. We stayed over for a while and sure enough, we too heard this odd sound coming from somewhere in the living room. We couldn’t place the sound but it was definitely eerie. Naturally, the conversation about the house being haunted started, but we decided it was probably something more realistic. This went on for a few days until one day she called us laughing uncontrollably. We asked what was so funny and she said the grandkids had come over for a visit, and the youngest, Charlie, wanted to play with his farm book. Now, this book was one of those interactive books where you press the animal and it makes a sound. He had left it in the toy box in the corner of the living room. He pulled it out and pressed the various animals only to discover most of them didn’t work, he pressed the cow and this low moaning sound came from the book. The batteries were so low from it being jammed in the toy box and being pushed up against another toy, it would go off occasionally, draining its battery. This farm book cow was the culprit for making the ghostly sounds! We laughed over it for years.