“- Michael: Maybe he's not that smart. Maybe he's like a worker bee who only knows how to push buttons or something.
- Elliott: He is too smart.
- Michael: Okay, I just hope we don't wake up on Mars or something surrounded by millions of little squashy guys.”

Robert MacNaughton - Michael
Henry Thomas - Elliott

“- Uncle Martin: Martians use 100% of their brain while humans only use 10%.
- Tim O'Hara: No, we're smarter than that.
- Uncle Martin: Your astronauts pee in their spacesuits. Case closed.”
Chris Lloyd - Uncle Martin
Jeff Daniels - Tim O'Hara

“- Peter Parker: You once spoke to me about intelligence. You said it was a gift to be used for the greater good...
- Doc Ock: A privilege...
- Peter Parker: These things have turned you into something else. Don't listen to them.”
Tobey Maguire - Peter Parker
Alfred Molina - Doc Ock

“- Kay: We are the best kept secret in the galaxy. We monitor, licence and police all alien activity on the Earth. We're your first, last, and only line of defense. We live in secret, we exist in shadow.
- Jay: And we dress in black.”
Tommy Lee Jones - Kay
Will Smith - Jay

“All right, kid, here's the deal. At any given time there are approximately 1500 aliens on the planet, most of them right here in Manhattan. And most of them are decent enough, they're just trying to make a living.”

Tommy Lee Jones - Kay