The death of Zilla, despite everything it had done and all the people who died because of him. You can't help but feel a little pity for the big guy (or girl) when he finally goes... and in his last moments he just stares at Nick with a resigned look in his eye, before shutting them for good.
- The novelization adds to the tearjerkiness. For context, much of the novel is from Nick's POV, and this passage comes after the F-18s' final run:
We turned around just as Gojira's enormous head came crashing down onto the bridge. It landed directly on top of the taxicab, crushing it like a paper cup. The bridge swayed violently and the steel cables moaned, threatening to pull loose from their mighty anchors. But the bridge - or what was left of it - held, and the swaying slowly subsided.
I took a few steps back toward the creature's head, which towered above me. One of his hundred-pound eyeballs was pointed in my direction, but I don't think he saw me. The nictitating membrane was half closed and the iris had a glazed, weary look. He blinked slowly and exhaled, the breath of life slipping out of him.
I felt like rushing over to him and trying to offer him some comfort. I wanted to explain that we'd only done what we had to do. The Earth just wasn't big enough for both our species. But in the end, I just stood there. And then he was dead.