I'd never do that. Watching a movie like HP online instead of seeing it in the theatres first is some kind of pathetic.
Thing is, I really do want to watch it with my friends. I've had two opportunties to see it without them and i turned them down. I really want to watch it with them. Or... at least... with my guy best friend. We're the only ones who interact with one another when the group of us see a movie. So, really, I want to see it with him.
Point is, I can wait. =]