Any of his lines from the manga will do.

(Explosively Angry)

"EXCUSE ME!"

(Awkward pause, he is doing his very best to hold in his anger at Louis)

"Louis.... May I talk to you?"

(trying to be alone with louis {presumably to attack him} he snaps at legoshi, who is the only other person in the room besides Kai and Louis)

"HEY! What are you doing here??! You're on the Production Crew!"

(just add a couple of angry yells at the end because Kai does that a lot)