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Source: South Park 24/7

 617 - Red Sleigh Down
1) When Kenny walks on to the screen at the end of the episode (after a 16 episode absence) he says "Hey guys. What's goin' on?"
2) Kenny tells the Kyle "Oh, I've just been hanging out." after he asks where he was.
3) Kenny says "Yeah" when Stan says that things are finally back to normal.