There's nothing inside the box.

"Why would anyone want to get over the one thing you hope for from the minute you're born, and remember every day until you die?"
"Because it'd supply the illusion of power and control."

"And what's that good for ?"
"Oh, uncle Arby! Illusions are by their nature sweet."

"So you'll be lonely, sad and fat."
"What would you have me do ? Face on the floor, bare ass up to the winds just because he said hello ? Like a moth or some such type of primitive life ?"

"You could just say it. Why does everything always have to come to such extremes with you ?"
"Extremism makes it that much easier to pretend there's nothing in between."

"Well... at least you didn't bring whatever obscure book you like to misquote into it."
"I really don't think that book has anything to do. With anything."

"Then why do you bother with all the pretending, and all the rest of the bullshit ?"
"Nobody can prove it doesn't, so they have no reason to act as if the truth were the truth. Because they can't prove it. And that makes a difference!"

"No, it doesn't."
"I guess maybe it doesn't. But I can still pretend as if it did anyway."

"Sure, you can still pretend. What's that do, for anyone ?"
"Nothing. It does exactly nothing at all, not for anyone. We can just ignore each other all the better : myself and everyone, everyone and myself. It's easier that way."

"And after all the ignoring's done ?"
"Then I die."

"Sad, fat and alone."
"That's true ; but nobody will can accuse me of it. Not of any of it!"

"I... guess. You're what's wrong with the world pretty much exactly."
"Isn't that the definition of youth, pretty much exactly ?"

Writing dialogue's not difficult at all, if one manages to think outside the box.