I love this show, and I recently came across the best trivia question ever.
When was the first time Matt Stone and Trey Parker did the joke where the kid takes off the hat they're always wearing and a big puffy red afro like head of hair comes out?
Example: The one where they do the buttface joke, and kyle has to take off his hat, then all the red hair.
I will award 15 TP's to the first person to get this answer to my satisfaction.