South Park, Season 8

[As Stan, Kyle, and Kenny prepare to infiltrate and destroy Wall-Mart, they are confronted by Cartman wielding a dagger:
]

Cartman:
Wall-Mart's a great store! I cannot let you fools ruin its terrific bargains. You see, I was working for Wall-Mart all along!

Kyle:
I knew you were.

Cartman:
No, you didn't.

Kyle:
(frustrated) Yes, I did. I said from the beginning that you would do this!

Cartman:
No, you didn't.

Kyle:
Yes, I did!

Cartman:
No, you didn't!

Kyle:
Yes, I did!

Cartman:
No, you didn't!

[Kyle and Cartman argue back and forth like this until they're shouting at the same time.]

Cartman:
(after a brief silence) You see, Kyle, it was me who slashed the bus tires-

Kyle:
(speaking over him) -slashed the bus tires in Arkansas. I said so! I told you the minute-

Cartman:
(places hands over ears) LALALALALA! I CAN'T HEAR YOU!

Kyle:
Hey, I told you-

Cartman:
I CAN'T HEAR YOU! LALALALALA!

[They both go silent]

Cartman:
(brandishes dagger again) I'm sorry, boys, but if you want to hurt the Wall-Mart, you'll have to go through me.

Kyle:
We don't have time for this! Kenny, keep him away from us.

[Stan and Kyle go around Cartman, while Kenny steps up and faces him.]

Cartman:
Very well, Kenny. Let us battle!

[Kenny starts hitting Cartman]

Cartman:
Ow! Kenny! Kenny, knock it off!