When games fade to black in order to load, the black overlay is semi-transparent, and I can see games setting up the scene.
For example, in Mega Man X3, when I leave the pause menu, normally there should be a black screen while the action screen loads in. Instead, I see a semi-transparent black, while underneath it, the game loads in assets and arranges them onscreen.
Or, in FF3, I can watch as the objects and the backdrop for an area are panned into place before the scene is properly revealed.