I'll start: as a film major, I could talk in length about several aspects of filmmaking, especially writing and directing.
EDIT: I'm overwhelmed with such a high number of interesting responses. You guys and girls know a lot of interesting stuff that goes way beyond my intellectual abilities. This is not an attempt to be modest or to draw empty compliments, it's quite simply the truth. That is the reason I did not answer to any comment yet. I wanted to make a proportional effort (I also got a new dog and he's awesome, but that's unrelated hahaha). I will try to do so tonight, and probably create a related thread to you guys can speak a little more about your awesome obsessions. Cheers!