Played another movie on my DVD player, and was glowing hot again. It did not start as early in the movie this time, though. Perhaps because the room was cooler. It is still my head that is most hot. Intriguingly, I did not grow much hot when I watched Unbreakable a second time, and not all that much when I watched X-men. (I had read the comic album based on the movie.) I think this confirms my theory that the heat comes from my brain working hard to assimilating the movie. Strange as it may seem.
Oh, and the movie was "Crouching Tiger, Hidden Dragon". Gotta love those leap scenes. It made me itch to play Daggerfall again. :)