Space

I have a non-political question about science fiction cinema.

There is no up or down in space. Why is it, then, that every space battle involving starships situates those ships on the same plane, as if they were at sea? Whenever the Enterprise faces off against a Klingon ship, both vessels are on the same axis, in terms of top-to-bottom. Yet if such a face-off were to occur in real life, the Klingon ship might be upside-down or at a 90 degree angle, from the Enterprise's point of view.

Can you think of a scene in a major science fiction film which depicts two large spaceships "off-axis"?