I pretty much never watch a movie on the plane … meaning I never put the headphones on and listen to it … but one cannot help to occasionally see the movie overhead. And if you fly the same airline a lot, you can start to piece together the movie without actually seeing it.
Last fall I think I was on a total of 5-6 flights that had the movie Speed Racer on it. without ever watching the movie, I pretty much know the plot. It is funny how unnecessary sound is.