This right here is just one of those moments. I remember reading it a couple of years ago and you can just feel the tension as you flip the pages, knowing that you are going ever closer to a point that will change everything. You get to the final few pages and you realize that, maybe, it won't have happened if you just don't turn that page.
And then you do and Gwen Stacy dies.
Also, this isn't a comic, but I just realized that Wolverine is never going to know that Daken gave him a respectful and sweet funeral. That makes me sad.