Kirk: What were you trying to do?
Spock: I surmised you were unaware of that plant, so I --
Kirk: Took the thorns yourself.
Spock: I assure you, Captain, I had no intention of doing that. My own clumsiness prevented me from moving out of the way.
Kirk: Next time, yell. I can step out of the way as quickly as the next man.
Spock: I shall do so.
Kirk: You know how much Starfleet has invested in you?
Spock: (helpfully) 122,22 --
Kirk: Never mind. But...thanks.