[e of pi]

Lennier: Just a minute... almost... aha! Got it!
Delenn: You've fixed the navigational thrusters?
Lennier: No, I've got Tetris working.

Well, I may not have seen the episode, or even the series, but that is a funny scene.

Lennier: We're almost out of options, but there's one last thing I could try....
Delenn: I shall tell you what I told John: I am not wearing that.
Lennier: Hark, the telltale sound of sensors picking up approaching Centauri vessels. Before we die, I'd just like to tell you that I wish I could Leia.
Delenn: Unfortunately, you'll have to go Solo.

Ditto.

Londo: And now the end is near... so I face my final curtain.
G'Kar: Don't be so melodramatic, Mollari, it's just a coronation. They wave a sword at you, drop the crown on your foot, and then you're emperor. Simple as that.
Londo: You'd think so, but I said "King me!" to the High Priest earlier and he beat me over the head with an Earth checker.
G'Kar: Perhaps he thought you were being metaphorical?

Return of Ditto!

Sheridan: Wow, what an adventure. It's good to be home. Now, what do you have to show me?
Franklin: Oh, nothing. Just a little hell-spawned demon that chewed half my face off.
Shadow Hamster: (beams)
Sheridan: This cute little thing did that?
Franklin: Don't touch it!
Sheridan: Oh, stop being so paranoid. It looks completely harml-- GAAAAHHHH! MY JUGULAR!
Franklin: Warned you.

Son of the ditto!

Ranger: Sir, I'm picking up coded signals, but I can't quite make them out. I'm pretty sure this x2 functions as the symbol for Centauri.
Sheridan: And this 2x?
Ranger: Centauri Prime.

And would this be the scene? Just a guess...