Do you actually watch what you're watching on TV?

I've become aware lately that when I do have the TV on I'm rarely ever actually watching it. Doesn't seem to matter if it's a movie or a home builders show or cooking show, I'm always doing something else while it's on. Mostly I'm on the computer, either online or playing games, cards, Angry Birds and such. I can't remember the last time I watched something from start to finish without doing something else and basically just listening.

Am I alone in this?