Robert said:
I don't know where the series would have been without Kirks miracle worker.
I about died laughing when he was trying to talk to the Apple pc in Star Trek IV: The Voyage Home.
That was an absolute classic.
[Scotty faced with a 20th century computer]
Scotty: Computer. Computer?
[Bones hands him a mouse and he speaks into it]
Scotty: Hello, computer.
Dr. Nichols: Just use the keyboard.
Scotty: Keyboard. How quaint.
Edit: A few more classics I have found on the net
Star Trek III: The Search for Spock (1984)
[Their first look at the U.S.S. Excelsior]
Uhura: Would you look at that!
Kirk: My friends, the great experiment: The Excelsior. Ready for trial runs.
Sulu: She's supposed to have transwarp drive.
Scotty: Aye, and if my grandmother had wheels, she'd be a wagon!
Kirk: Come, come, Mr. Scott. Young minds, fresh ideas. Be tolerant!
Star Trek VI: The Undiscovered Country (1991)
Captain James T. Kirk: Mr. Scott?
Scotty: [over intercom] Aye, sir?
Captain James T. Kirk: Did you find the engine room?
Scotty: Right where I left it, sir!
Star Trek: Generations (1994)
[Kirk is invited to give a command to the new Enterprise-B]
Kirk: Take us out.
Chekov: Very good, sir.
Scotty: Brought a tear to my eye.
Kirk: Oh, be quiet.
taken from
here