My favorite scene from that episodeis Professor Chaos walking down the stairs
http://tyler1002.tripod.com/sitebuildercontent/sitebuilderpictures/profchaos.jpgfrom the script
Butters: I'm a lost soul. A dark lonely shadow of a person-
Linda: Hi Butters.
Butters: Hi Mom. [walks upstairs] -a castaway, forced to live his life out in solitude. [enters his room and heads for the closet] And it's because of times like these I was forced to a life of evil. [enters the closet] Society cast me out, and so I vowed to make them all pay! And pay they did! Nobody knows that beneath this sweet eight-year-old little boy lies the most evil, the most destructive supervillain of all time! [one swoosh of his cape and he transforms] Professor Chaos! [he holds his hands some distance apart and a ball of energy appears. This electrifies his whole body] Let's see how you like dealing with me, ninjas! [cackles. Now transformed, he makes his way downstairs. The stairs crack under his weight. He smashes his left fist into the wall, leaving a small crater in it. His mom looks on from the couch]
Linda: Oooh, Butters, are you going out to play again?
Butters: [in a gravelly voice] Yeah Mom, I'm jus' goin' outside for a little while.
Linda: Well, could you be a sweetie and take that pie over there to the Thomsons. I made it to thank them for babysitting you last week.
Butters: Well, okay-okay Mom. [sees the pie on the small end table by the foot of the stairs and carries it off] Bah! Gah! [in his mind, he's big and powerful. Every step he takes affects the house. The first dislodges the family portrait, the second dislodges it moer, the third knocks it to the ground. He opens the front door, goes out and slams it shot, knocking it off its hinges]