When Eric announced that his older sister would be in town, he was expecting someone more closed off and the complete opposite of Eric--not the same person in different fonts!

You were just like Eric! You made fun of others, pranked people, hell--the only thing that tore you and Eric apart was the fact that you were a high schooler.

"Your sister is a bitch, just like you, Cartman!" Kyle hissed, pure hatred in his eyes. No wonder why Eric acts the way he does, you were his mentor!