Simmons: Hey.
Grif: Mmyeah?
Simmons: D'you ever wonder why we're here?
Grif: It's one of life's great mysteries, isn't it? Why are we here? I mean, are we the product of some... cosmic coincidence? Or is there really a God, watching everything, you know, with a plan for us and stuff. I don't know man, but it keeps me up at night.
Simmons: What? I mean why are we out here, in this canyon?
Grif: Oh. Uhhhhh. Yeah.
Simmons: And what was all that stuff about God?
Grif: Uhhhhh. Hm? Nothing.
Simmons: ...Do you want to talk about it?
Grif: No.
Simmons: You sure?
Grif: Yes.
Simmons: Seriously though, why are we out here? As far as I can tell, it's just a box canyon in the middle of nowhere. No way in or out.
Grif: Mmhm.
Simmons: The only reason that we set up a red base here is because they have a blue base over there. And the only reason they have a blue base over there is because we have a red base here.
Grif: Well, yeah, that's because we're fighting each other.
Simmons: No, no, but I mean... even if we were to pull out today, and they were to come and take our base, they would have two bases in the middle of a box canyon. Whoopdee-♥♥♥♥♥♥-doo.
Grif: What's up with that anyway? I mean, I signed on to fight some aliens, next thing I know, Master Chief blows up the whole Covenant Armada, and I'm stuck in the middle of nowhere fighting a bunch of blue guys!

https://www.youtube.com/watch?v=9N8IpxO6rKs