Tony Stark: What's the vibranium for?
Ultron: I'm glad you asked that, because I wanted to take this time to explain my evil plan.
James Rhodes: Think I can’t hold my own?
Tony Stark: We get through this, I’ll hold your own.
James Rhodes: You had to make it weird.
Ultron: You're incredibly naive.
Vision: Well, I was born yesterday.
Maria Hill: All set up, boss.
Tony Stark: Actually [points to Cap] he's the boss. I just pay for everything and design everything, make everyone look cooler.
Iron Man: [After incapacitating a room full of bad guys] Good talk.
Crippled thug: [Whimpering] No it wasn't.
Hawkeye: Are you up for this? Are you? Look, I just need to know because the city is, is flying. Okay, look, the city is flying, we're fighting an army of robots, and I have a bow and arrow. None of this makes sense.
Tony Stark: Please be secret door. Please be secret door. Please be secret door. [Finds secret door] Yay!
Captain America: You get hurt, hurt 'em back. You get killed...walk it off.
S.H.I.E.L.D. Officer: Number six boat is topped and locked...or, uh...or stocked, topped...it's uh, full of people.
Nick Fury: Guy’s multiplying faster than a Catholic rabbit.
Natasha Romanoff: [Talking about Hawkeye] Are you sure he’s going to be OK? Pretending to need this guy really brings the team together.
Ultron: I know you're good people. I know you mean well. But you just didn't think it through. There is only one path to peace... Your extinction.
Ultron: You think you're saving anyone? I turn that key and drop this rock a little early and it's still billions dead. Even you can't stop that.
Thor: I am Thor, son of Odin, and long as there is life in my breast...I am running out of things to say. Are you ready?
[Vision sucker punches Ultron with Thor's hammer.]
Vision: It's terribly well-balanced.
Thor: Well, if there's too much weight, you lose power on the swing.
Maria Hill: He’s fast and she’s weird.
Ultron: Everyone creates the thing they dread.
Tony Stark: [Mid-battle with Hulk.] Hit me in the back?! Dick move, Banner.
Tony Stark: You listening? That little witch is messing with your mind. You're stronger than her. You're smarter than her. You're Bruce Banner.
[Hulk roars angrily.]
Tony Stark: Right, right, right. Don't mention puny Banner.
Natasha Romanoff: Thor, report on the Hulk.
Thor: The gates of Hel are filled with the screams of his victims!
[Natasha glares at him while Bruce groans and puts his head in his hands.] Thor: But not the screams of the dead, of course. No, no... Wounded screams... Mainly whimpering, a great deal of complaining and tales of sprained deltoids and...gout.
Chosen answer: The pool allowed Thor to relive the vision that Scarlett Witch made him see. It's through the vision that he finds out that Loki's staff contained an infinity stone and it would be to dangerous to destroy. He also sees the creation of Vision. He also sees that Asgard is in trouble. Since Selvig is an expert (as much as one can be) in Asgard and Earth he would be the one to help Thor find the pool. Many of the scenes relating to the pool were cut and could appear in the home release.