You moved around a lot — Mexico, Argentina, Peru, and other places — because of your parents' jobs, until you ended up in South Park. Your parents enrolled you in the first school they could find. There were other options, but you ended up there. On the first day you were afraid of socializing, since you’d always been picked on at the other schools, but you fit in perfectly. You talked to different people and everything, and eventually you started hanging out with Stan Marsh, Kenny McCormick, Eric Cartman, and Kyle Broflovski. You liked them — they were idiots, but you liked them — and you became the fifth member of the friend group.