I was sitting on the couch, reading an article, when I realized I had finished it but had no idea what it was about.
I realized I was not only reading the article, but was listening to a podcast with headphones in one ear, and was watching a baseball game on TV. Not only that, but my wife was occasionally talking to me about something.
I couldn't tell you what I read, listened to, or what's happening in the game. Of course, I could tell you exactly what my wife said, because I hear everything she says (not)