"By the way, Doctor, I was thinking about what you said about myself and Mudd's robots," Spock said to Bones on the bridge shortly after they'd left Mudd on "his planet."
Bones nearly rolled his eyes. "Enlighten me, Spock."
"There is one thing that distinguishes me from a robot or android."
"And what's that?"
"Free will. I can choose the best course of action according to information provided. A robot can only do what it is programmed to."
"See, that sounds like something a robot would say," Bones interjected.
"On the contrary," Spock said. "You do the same thing in sickbay. You make the best choices for your patients to best perform your function as the ship's chief medical officer."
"Well, I -"
"We are more alike than you might think, Dr. McCoy."
Bones let Spock have the last word. This time.