A good deal of the banter between Kasumi and Garrus is hilarious. One of the highlights is on Tuchanka after the events at the Hollow.
Kasumi: "You look entirely too satisfied with yourself."
Garrus: "Not every day I get to act it up like some over muscled vid-star, Kasumi. Let me bask in it for a minute. Where were you anyways? Didn't feel like joining the universe's most bizarre krogan krantt?"
Kasumi: "You know better than that. The spotlight isn't for me. Best, not most famous, remember?"
Kasumi: "You do know I'm capable of hacking your armor's environmental controls?"
Garrus: "So... that's a no on the gauze and metal bikini?"
- Yet another moment between Garrus and Kasumi
Garrus: "Daydreaming on us, Sneaky?"
Garrus: "Vega has taken to calling me 'Scars'. Figure I'd try my hand at this nickname thing too."
Kasumi: "Hmm... but 'Sneaky'? Really? I expected more out of you, Garrus."
Shepard: "She's got a point there."
Garrus: "You started this in the first place. At least 'Scars' sounds appropriately manly."
Kasumi: "What, 'Gare' isn't manly? How about 'Garry'? Just imagine the look on people's faces when you're introduced as 'Garry the turian'."
Garrus: "You're enjoying this far too much."
Kasumi: "No, enjoying it far too much would be mentioning a message from Dr. Michel on the Citadel calling you... what was it?"
Kasumi: "Oh yes, I think it was 'Garebear'."
Vega: "Whoa... did I just hear what I think I heard?"