Allison: Hey, aren't you supposed to be teaching school right now?
Mrs. Garrison: The school hired a substitute to cover for me.
(scene changes to South Park Elementary where the kids are being taught math)
Mexican: And so, to find the sum of the two fractions, you must always first check for the lowest common denominator.
Other Mexicans: Si, yeah, si...
Stan: These guys are pretty good.
Kyle: Yeah, I think I'm actually learning something.