I have a friend (in HERO CORP. he's The Man from Mars) who doesn't watch movie trailers. At all. He'll literally close his eyes in a movie theater, or go to the concession stand until they are over. He believes trailers influence your expectations of the actual movie so much, they typically ruin the final experience. I'm nowhere near as all-or-nothing as he is on this topic, but he's got a big point.
Most of my artwork is currently being channeled into issue two of H.C., and as every panel is finished there is a large part of me that wants to show it off immediately. It doesn't help that so many of the characters in the story are essentially me and my friends. They have no idea of how often I want to pick up the phone and say, "Guess what? I'm drawing you right now!" More than once I've received calls from friends as I was looking at their photo-references and drawing them. Yes, it's a little spooky.