Eric Cartman age progression (my version):
song : "ur mum"
First day of high school, they've been put in a line and it's making Stan nervous. They're 14yrs here.
(Lined up to be sorted into form groups, Stan is going through weed withdrawal after a long summer on the weed farm [stan was out working on the burning hot summers day, so hot the weed started to smoke], now the winter withdrawal is making him paranoid).
Following this convo, Kyle gets in trouble for the whisper-shout being too loud (he gets a glare and shushed by the teacher), Kenny holds the cigarette to Stan so he can have some, then Kenny crushes it under his shoe. Stan, new to smoking, holds the smoke in for too long then coughs loudly smoking wafting out with the coughs as the teacher looks over due to the noise, they all get in trouble and spend their first evening in detention :( Where they meet their estranged friend cartman for the first time that day
(from alt universe where south park are comics written by kenny from 9yrs old into adulthood in the "south park" comics Kenny drew he amped up his friend's personalities for comedic effect, and made a lot of stuff up)