Thanos: In all my years of conquest, violence, slaughter, it was never personal. But I'll tell you now, what I'm about to do to your stubborn, annoying little planet... I'm gonna enjoy it. Very, very much.
Stan Lee: Hey, man! Make love, not war!
Steve Rogers: Hail Hydra.
Pepper Potts: We got really lucky.
Tony Stark: Yeah. I know.
Pepper Potts: A lot of people didn't.
Tony Stark: I can't help everybody.
Pepper Potts: It sort of seems like you can.
Tony Stark: Not if I stop. I can put a pin in it right now. And stop.
Pepper Potts: Tony, trying to get you to stop has been one of the failures of my entire life.
Thanos: I will shred this universe down to its last atom, and then, with the stones you've collected for me, create a new one.
Tony Stark: What we needed was a suit of armor around the world! Remember that? Whether it impacted our precious freedoms or not, that's what we needed!
Steve Rogers: Well, that didn't work out, did it?
Tony Stark: I said we'd lose. You said, "we'll do that together too." Guess what, Cap? We lost, and you weren't there. But that's what we do, right? Our best work after the fact? We're the Avengers? Not the Prevengers, right?
Thor: Mother, I have to tell you something...
Frigga: No, son, you don't. You're here to repair your future - not mine.
Rocket: You think you're the only one that lost people? What do you think we're doin' here? I lost the only family I ever had. Quill, Groot, Drax, the chick with the antenna - all gone! I get that you miss your mom. But she's gone - *really* gone. And there are plenty of people who are only *kinda* gone. And you can help them.
Tony Stark: Did she have any family?
Steve Rogers: Yeah. Us.
Bruce Banner: If we do this, how do we know it's going to end any differently than it did before?
Carol Danvers: Because before, you didn't have me.
James Rhodes: Hey, new girl? Everybody in this room is about that superhero life. And, if you don't mind my asking, where the hell have you been all this time?
Carol Danvers: There are a lot of other planets in the universe, and, unfortunately, they didn't have you guys.
Tony Stark: What's wrong with him?
Rocket: He's pissed. Thinks he failed. Which, of course he did, but you know, there's a lot of that going around, ain't there?
Steve Rogers: You know, I saw a pod of whales when I was coming in, over the bridge.
Natasha Romanoff: In the Hudson?
Steve Rogers: Fewer ships, cleaner water...
Natasha Romanoff: You know, if you're about to tell me to look on the bright side - I'm about to hit you in the head with a peanut butter sandwich.
Steve Rogers: Sorry, force of habit.
Rocket: Who hasn't been to space? You better not throw up on my ship!
Dr. Stephen Strange: If I tell you what happens, it won't happen.
Natasha Romanoff: This is gonna work, Steve.
Steve Rogers: I know it is. 'Cause I don't know what I'm gonna do if it doesn't.
Steve Rogers: Avengers! ...Assemble.
Gamora: This is the one? Seriously?
Nebula: The choices were him or a tree.
Tony Stark: No amount of money ever bought a second of time.
Steve Rogers: I can do this all day.
Steve Rogers: Yeah, I know.
Natasha Romanoff: Killing all these people isn't going to bring your family back. We found something. A chance - maybe...
Clint Barton: Don't.
Natasha Romanoff: Don't what?
Clint Barton: Don't give me hope.
Natasha Romanoff: I'm sorry I couldn't give it to you sooner.
Suggested correction: He needed to hot-wire the van. It's quite possible he could have left the van for parts (he's seen slamming a Leviathan to the ground) or to protect it. It also could have been an illusion by one of Dr. Strange's people.
DetectiveGadget85
Sorry but the suggested correction makes no sense. For one Dr Strange's people have no idea what Ant-Man looks like, and secondly Ant-Man would have no idea where to get parts from in the middle of a battlefield, let alone know if alien technology would be compatible. Also the time frame given when the scene plays out allows no time for him to leave the van, this is a legitimate mistake.
Dr. Strange's people don't know what Ant-Man looks like? He entered the battle with them long before they went to the van. Earth has had access to the same Leviathan parts since the original Avengers. If Toomes can make wings out of it in Spider-man Homecoming, it's possible he can figure something out. Clint had passed the glove to Black Panther before Ant-Man is seen in the background. There was plenty of time. He also could have been defending the van while they brought the glove.
There is plenty of time for Ant-Man to have left the van and returned to it. As the scenes play out, Ant-Man and Wasp are in the front of the van trying to hot wire it. The film then cuts to the battle for several minutes, as we see the passing off the gauntlet, which includes the brief shot of Giant-Man in the background. A few minutes later the film cuts back to the van and we see Scott opening the rear door of the van. So there's plenty of time for him to have gotten out of the van, saw potential trouble with the Leviathan, turned into Giant-Man to stop it while letting Hope finish activating the tunnel, and then returning to check the final settings. Now, all this raises another question that has to do with the apparent ease Giant-Man has in traversing the battlefield, as in why not just give Scott the gauntlet, have him turn into Giant-Man, take a few steps over to the van, and then shrink back down to take the stones back in time?
Vader47000