This is a cel from the movie Spriggan. You can see that the cel and background are proportionally longer than the cel designed for the TV screen. Another interesting thing is that movie cels not only have different proportions than TV/OVA cels, but some of them are larger overall. This is because the image needs to be projected onto a much larger screen in the theaters. Rather than have to deal with trying to paint really tiny areas of detail, some studios elected to use bigger cels.