It's been a couple years ago now, but my wife's grandfather was quite ill and living with his daughter (my wife's aunt) for some time.  He passed away peacefully in his sleep one morning. When she discovered him, after making the obvious first calls for a doctor/coroner etc, she called her sister (my wife's mother) to give her the sad, but not unexpected, news.  The name that appeared on my mother-in-law's "caller id" was that of my wife's grandfather! He was never ever registered on that line or anything, he had just moved in there a few years earlier after he could no longer take care of himself, but the phone company should not have had his name at all.  We tried to replicate the condition, calling from my "Aunt-in-law"'s house to my mother-in-law and others, but the caller id would show the aunt's name -never again did any show the grandfather's name. Very strange.