My wife and baby were recently out of town and I was living home alone for the first time since my daughter was born.
Prior to that, we had been doing some sleep training trying to teach my baby daughter how to self-soothe. This teaches you the schizophrenic skill of being able to simultaneously hear her cries over anything and ignoring them all at the same time.
In the empty house, it was the strangest thing to hear her cries over the TV and especially in the silence. It was like phantom ringing or phantom phone, but with babies.