Megatron: Is the future of our race not worth a single human life?
Optimus Prime: You'll never stop at one... I'll take you all on!
Jetfire: I'm getting too old for this crap.
[Dropping Sam off at college.]
Judy Witwicky: Can you smell that?
Ron Witwicky: Yeah, it smells like forty thousand dollars a year.
Simmons: 75 years of alien research which points to one inescapable fact: the Transformers, they've been here a long, long time.
Jetfire: My father was a wheel, the first wheel, you know what he transformed into?
Sam Witwicky: No.
Jetfire: Nothing! But he did it with honor, pride and dignity!
Sideswipe: Damn, I'm good.
Leo: Ever heard of realeffingdeal.com?
Simmons: Oh, you must be talking about that site with Game Boy level security.
Mudflap: Ow! That hurt!
Skids: It's an ass-kicking, it's supposed to hurt.
Mikaela Banes: I'm breaking up with you.
Sam Witwicky: Wow, you almost sounded serious that time.
[Bumblebee has just destroyed the Witwicky's home.]
Ron Witwicky: Think of this as the renovation we always wanted.
Judy Witwicky: If the government's paying, then I want a pool! And a hot tub! And I'm going to go skinny-dipping and you can't say shit about it!
Sam Witwicky: I'm sending over the D-Day shirt.
Mikaela Banes: I can't believe you still have that.
Sam Witwicky: Yeah, I bled in this thing. It's like my Rangers jersey.
Sergeant Epps: I hope these F-16's got good aim.
Major Lennox: Why's that?
Sargeant Epps: Because I told them to hit the orange smoke.
Major Lennox: You mean that orange smoke? [Points to orange smoke right next to them.]
Sargeant Epps: It wasn't my best toss.
Sam Witwicky: Look, the guardian thing is done, okay? You did your job. It's over with. You've gotta be something else, you've got have a bigger purpose then just me, Bee! I can't be the end all deal in your life!
Bumblebee: "What is."."your."."purpose.". Sam?
Sam Witwicky: I don't know. I wanna... I wanna be normal, I want to go to college. Everybody has this, and I should be able to experience this. And I can't do that with you.
Sam Witwicky: You don't stop, you don't hide. You run. You understand me?
Ron Witwicky: We're all going together!
Optimus Prime: Sam, fate rarely calls upon at a moment of our choosing.
Sma Witwicky: You're Optimus Prime, you don't need me.
Optimus Prime: We do, more than you know.
Optimus Prime: We've kept much from you, Sam.
Answer: After the tomb, he doesn't appear onscreen again. There's no indication as to what happened to him.
JAGwire