First prize: the scene where Cartman says "ask the question",sings "nononono-no nononono-no nononono-nonononononooo", and ends twith "doesn't seem to have much time, tick tock tick tock" (the kidney transplant episode)
Second: LIAR!!! YOU GODDAM LIAR!!! YOU WELL KNOW WHAT HAPPENED TO YOUR CHILDREN, CONFESS! CONFESS!! (Butter's very own episode)
Third: Cartman again "..BY THE POWER OF THE LORDAH..." and "I should answer the phonnah"... well, you got it :)