matching words

I often read a book while my wife is watching television. It frequently happens that a word or phrase just spoken on television is the one i have just read at exactly the same time. I would expect this to happen with very commonly used words or where I am reading a newspaper and the news is on TV. However, it often happens with uncommon or obscure words or phrases, and what makes it seem strange is that the word is spoken at precisely the same moment that I am reading it. It happens so frequently that I now expect it and it's no longer remarkable. I haven't heard other people talk about this, but wonder how common it really is.