at the beginning of "The Kids" where he is imitating the south park voices
as Mr. Mackey, he says "Brian, don't throw that" to which the kids replys "Shut up!"
anyways, on Relapse any one notice at the end of Underground after the rain storm noise has gone away just before Ken Kaniff comes in with his tap dancing ... there is a man that comes in and says
"it wasnt a choice, I had to do this, and now i got 90 days clean, and , uh, thats all i have to share, thanks"
Clapping
then another voice comes in (who i assume is the instuctor of the meeting) he says "well, thanks for sharing Brian"
could this Brian be the same Brian character from The Kids song all those years ago?