Jack's refusing, saying none of this is real, and Locke can push the button his own goddamn self. But Locke's not buying Jack's trust in science. I know, hard to believe. "If it's not real, then what are you doing here, Jack? Why did you come back? Why do you find it so hard to believe?" Jack wants to know why Locke finds it so easy. "It's never been easy!" shouts Locke. Everyone watches the showdown as the timer's down to 1:04. Kate offers a "Maybe you should just do it," but Jack dismisses even her with a "no, it's a button." Locke says he can't do it alone: "I don't want to. It's a leap of faith, Jack." And this has been discussed endlessly in the TWoP forums, but it's worth pointing out here: you can just as easily tell Locke that it's just as big a leap of faith if not more so not to push the button. ["And that Kate or one of the other two could have just pushed it themselves. This scene is untenably contrived. Shut up, show." -- Sars]
The timer's down to 27 seconds, as Jack considers this. He strolls over to the computer, Sayid making way. He stands there, staring at the EXECUTE button. Shit, Jack, if you're going to do it, do it. The beeping speeds up when the timer hits ten seconds. Jack looks unsure for a moment, then hits the button. The timer's frozen at one second, then resets. Locke watches him, then walks over to the computer. "I'll take the first shift," he says, quietly. Jack kind of shakes his head and walks out of the room, presumably to go call dibs on the top bunk.