Steve Rogers: New haircut?
Thor: Looks like you've copied my beard.
Peter Quill: I'm gonna blow that nutsack of a chin right off your face.
Thanos: I know what it's like to lose. To feel so desperately that you're right, but to fail, nonetheless. It's frightening. Turns the legs to jelly. But I ask you, to what end? Dread it, run from it, destiny arrives all the same. And now, it's here. Or should I say, I am.
Nick Fury: Motherf...
Bruce Banner: Hulk? Hulk? I know you like making your entrance at the last second. Well, this it it, man. This is the last, last second. Hulk! Hulk! Hulk!
Hulk: No!
Bruce Banner: Oh, screw you, you big, green asshole! I'll do it myself.
[Thor arrives in Wakanda.]
Bruce Banner: Ha-ha! You guys are so screwed now.
Steve Rogers: Drop to 2600, heading 0-3-0.
Sam Wilson: I hope you're right about this. Or we're gonna land a lot faster than you want to.
Peter Quill: Tell me where the girl is or I swear to you I'm gonna French fry this little freak.
Tony Stark: Let's do it. You shoot my guy and I'll blast him. Let's go.
Drax: Do it, Quill! I can take it.
Mantis: No, he can't take it.
Doctor Strange: She's right. You can't.
Peter Quill: Groot, put that thing away, now. I don't want to tell you again. Groot.
Groot: I am Groot.
Peter Quill: Whoa.
Rocket: Language.
Gamora: Hey.
Drax: Wow.
Peter Quill: You got some acorns on you, kid.
Rocket: Ever since you got a little sap, you're a total d-hole.
Bus Driver: What's the matter with you kids? You've never seen a spaceship before?
Dr. Stephen Strange: What master do you serve?
Peter Quill: Oh, what master do I serve? What am I supposed to say, Jesus?
Tony Stark: You can't park here, buddy. Earth is closed today. Take your tractor beam and skedaddle.
Eitri: You're about to take the full power of a star. It will kill you.
Thor: Only if I die.
Eitri: That's what...killing you means.
Doctor Strange: I went forward in time to view alternate futures. To see all the possible outcomes of the coming conflict.
Peter Quill: How many did you see?
Doctor Strange: 14,000,605.
Tony Stark: How many did we win?
Doctor Strange: One.
Rocket Raccoon: How much for the gun?
Bucky Barnes: It's not for sale.
Rocket Raccoon: How much for the arm? [Buck walks off.] Oh, I'm gonna get that arm.
Peter Parker: I need you to create a distraction.
Ned: We're all gonna die!
Thor: The rabbit is correct, and clearly the smartest among you.
Rocket: Rabbit?
T'Challa: Wakanda forever!
Answer: Although many fans speculated it was because the Hulk fears Thanos after Thanos easily defeated him at the beginning of the film, the Russo brothers have since come out and said that it's because the Hulk feels that Banner only wants the Hulk around for helping him in fights, so his refusal to transform is a protest of sorts.
Phaneron ★
I think it's both.
Well it's not both. The Russo Brothers, who directed the film, have openly stated that the Hulk is not afraid of Thanos.
Phaneron ★