Ah. A-hah. Yes, that is very funny.

[tenelka]

Jacen: "The Force is too big."
Tenel Ka: "And this is what you learned in the five years you were gone?"
Jacen: "The core of it, yes."
Tenel Ka: "It took five years to learn that?"
Jacen: "There was a lot of travel time."

Jacen: "Hey, wanna hear a joke?"
Tenel Ka: "Only if you do not require me to laugh."

Jacen: "Say, what does an Imperial Star Destroyer wear to a formal occasion?"
Tenel Ka: "Why would Imperial Star Destroyers wear anything?"
Jacen: "Still don't quite have the hang of these jokes, do you? Come on, you know that's not the right response."
Tenel Ka: "Very well, what does an Imperial Star Destroyer wear to a formal occasion?"
Jacen: "A bow TIE!"