18. You have dreams about Terragen crashing during a overnight render, or not crashing.
(its happened to me in the past before TG2 x64)
19. In my case: I look out the window at the landscape in front of me at my work and try and guess how many instances of real world objects there are & how micro-triangles the real world objects would have have (trees, terrain, grass, ground cover, cars, etc, etc...)
then i think think about the AA settings used with what i see with my own eyes...