We experienced this recently. My wife, an avid mystery reader, solved it. We have a number of books in our house for grandkids, and she recently retired a number of them and put them in bags to give away. One of the talking books (you push a button and the book speaks like a cartoon character) obviously didn’t want to leave. Somehow one of the buttons got activated and the sound we heard was Minnie Mouse saying, “Don’t you just love tea parties.”
Not at four in the morning.