Yeah. So. The ship's computer decides to start playing practical jokes. It changes the dining room glasses for dribble glasses. It replaces Kirk's dining fork with a rubber fork. It puts a strange instrument on Spock's bridge console, with black ink on the eyepieces. (Unfortunately I didn't have space to show this in the strip. Maybe I should draw it as a bonus scene some time. It's quite hilarious.)

Later on (something I also didn't have room to show, alas), it tricks the chasing Romulans by deploying a giant inflatable copy of the Enterprise, larger than the ship itself. I kid you not.

How does it do any of these things?

Transcript

1
Captain's log, Stardate 3183.3. Fleeing Romulans who damaged us in a surprise attack.
Sulu: A strange energy field!
Kirk: Allons-y!
2
McCoy: A toast, to our narrow escape!
Spock: We have never toasted-
Kirk: Some joker's given me a dribble glass!
3
M'Ress: Ha ha ha!
Sulu: Ha ha!
Kirk: What's everyone laughing at?
{the back of Kirk's shirt has written on it "Kirk is a jerk"}
Computer: Ha ha ha!
4
Scotty: The ship's computer is playing practical jokes.
Spock: Uh... how??
Kirk: Well, reboot it.
Scotty: Uhura, McCoy, and Sulu are stuck in the rec room. It may harm them.
5
Caption: First appearance of a holo-deck. And it malfunctions.
Uhura: Who ever thought these things were a good idea?
6
Scotty: Flying through the energy field in reverse fixed the computer.
Spock: That makes no-
Kirk: Shoulda let me talk it to death.