Openings that overshadow what follows

So, I've had a couple conversations recently about films that had such striking and memorable opening moments that the rest of the film couldn't measure up, even if it was good. Here are a few examples, then you can tell me about your nominations in the comments.

28 Weeks Later: This sequel is a decent suspense film, though not as rich as the original, 28 Days Later. (Apparently 28 Months Later is planned.) But the first 10 minutes or so are absolutely riveting. You probably need to have seen the original to fully understand the intensity of these moments. But this is absolutely perfect suspense/action filmmaking, where each second matters, every decision is hurried yet vital, and death is all around you. Would you be able to choose life over all the things you thought mattered to you? Could you outrun bloody death at your heels? If only the inventiveness and intensity could have been sustained through the whole film.

Dawn of the Dead (remake, 2004): I am an aficionado of zombie films. I love the George A. Romero originals, in all their pretentious and overly symbolic glory. This remake by Zack Snyder is solid throughout, and definitely delivers the thrills and chills one expects of such a film. But, again, the opening is so brilliant, and so thrilling, that the rest can't help but pale a bit in comparison. Watching the world transform from what Sarah Polley's character (and we) know into something more horrific than her worst nightmares in just moments is utterly harrowing and a great example of what cinema can accomplish. Enjoy!

Saving Private Ryan: No, I don't mean the absolutely atrocious, dreadful framing device of Old Guy at Cemetery. (I'll probably post someday on what an awful thing that framing device is, just to purge myself of the bitterness of it. It fails on nearly every level.) I mean, of course, the 20 minutes of D-Day. Stylized, yet somehow more real than real. I felt myself ducking in the theatre, almost expecting the bullets to find me. Never have I been more grateful to be spared the firsthand horror of war. Sadly, the rest of the film, though solid, rarely rises to this level, with the possible exception of the whisper-filled knife-struggle near the end. (You know which one I mean. I still can't forget it.) And, do yourself a favor and just skip watching the Old Guy at Cemetery crapola at the beginning and the end. Ay carumba.

Casino Royale (new version, 2006): You know where I'm going with this one, so I'll keep it short. But you agree with me right? I mean, that first chase scene, with Daniel Craig's version of Bond chasing the free running dude through the construction site? Cinematic brilliance. Suspenseful, balletic, beautiful, hair-raising, and filmed with utter clarity. How many action scenes can you say that about these post-Michael-Bay days? The rest is fun, but the film never matches the nitrous-oxide high of that first chase scene.

If I was really cool, I'd have tried to figure out a way to make the opening of this post awesome, while the rest of it was just okay. Pretend I did that.

So, what are your nominations?