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Bones: It is a human characteristic to love little animals, especially if they're attractive in some way.
Spock: Doctor, I am well aware of human characteristics. I am frequently inundated by them, but I've trained myself to put up with practically anything.
Bones: Spock, I do not know too much about these little Tribbles yet, but there is one thing that I have discovered.
Spock: What is that, Doctor?
Bones: I like them... Better than I like you.
Spock: Doctor, I think I'll return to my station now.
McCoy: You ARE at your station, Mr. Spock!
Kirk: Dr. McCoy, I believe you're enjoying all this.
Spock: Indeed, Captain. I've never seen him look so happy.
McCoy: [To Spock] Shut up!
[Kirk opens his mouth to comment, but McCoy interrupts.]
McCoy: Shh! Shh!
[Dejected, Kirk lies back.]
McCoy: [Grinning] Well, what do you know? I finally got the last word.
McCoy: Spock, I've always suspected that you were a little more human than you let on. Mrs. Sarek, I know about the rigorous training of the Vulcan youth, but tell me, did he ever run and play like the human children, even in secret?
Amanda: Well, he, uh...he did have a pet Sehlat he was very fond of.
Amanda: It's sort of a...a fat Teddy bear.
McCoy: [Amused] A Teddy bear? [Sarek comes and takes Amanda away.] A Teddy bear [to Kirk].
Spock: Not precisely, Doctor. On Vulcan, the Teddy bears are alive...and have six inch fangs.