The Empath is one of my favorite TOS episodes. After Kirk volunteers (in the scene above) to be tortured in the place of Spock and Bones, the Vians tell him, “We’ve already observed the intensity of your passions, engaged your capacity to love others.” Later in the episode, Spock volunteers to be tortured in place of Bones, and Bones knocks him out with a hypo to prevent it. The crux of the episode hinges on the Triumvirate’s ability to sacrifice for one another, to love each other more than they fear pain and suffering. It’s a goddamn beautiful episode.
Spock lived in San Francisco to go to Starfleet Academy and that is likely where he first learned about slang and casual sort of speak of the English language so he’s probably firmly convinced that it’s 'soda’ (California is a 'soda’ state)
now just picture the triumvirate fighting about which exactly is the correct way to refer to a sugary, carbonated beverage