I saw Drive that past weekend after having managed avoid finding out ANYTHING about it beyond the fact that seemingly everyone who saw the film raved about it. It's rare I get to go into a film that unmolested by spoilers and reviews, and I have to admit, it was kind of fun.
I knew that this was my kind of movie partway through the opening sequence, when it became apparent that we weren't going to see the "getaway" shot or executed in the conventional "chase scene" sense. (I'm being deliberately vague in the hopes that some readers will have their curiosity piqued and be motivated to check it out themselves.) I didn't care what came next - that opening had me. It earned my complete faith and trust in the filmmakers.
What opening sequences have accomplished that for you?