I need help in humor class

Can you answer my question? I take a humor class because I wanna be a television writer. So they gave us this video to see but what is the joke from 12:34 - 12:50?
http://www.dailymotion.com/video/x3hrv5o

Question

I need help in humor class

Can you answer my question? I take a humor class because I wanna be a television writer. So they gave us this video to see but what is the joke from 12:34 - 12:50? 
        http://www.dailymotion.com/video/x3hrv5o

tori1423 · Answer

If you havent noticed this is the mathematics forum

adrimit · Answer

HA! fart joke

templeguy · Answer

@adrimit How is it a fart joke?

adrimit · Answer

wait, do you smell that?

templeguy · Answer

And so?

templeguy · Answer

@adrimit I didn't hear a fart...

adrimit · Answer

silent but deadly

templeguy · Answer

@adrimit What did she say to let the others know she farted?

adrimit · Answer

basically, i inferred by the girl's reaction to what the guy said. she said excuse me

templeguy · Answer

@adrimit And why did the girl in pink say "Oh! after she said excuse me

adrimit · Answer

like "oh, that's nasty" by the way there is a deeper joke in that interval.
girl in pink: "i'm not goin' somewhere looking like some fool"
guy in blue: "you look like one now"
girl in striped shirt: "ain't no one gonna look like a fool. Me, I'm gonna walk in like the lady I'm is"
then she proceeds to fart

templeguy · Answer

Okay, last question @adrimit 

Why did the girl laugh like that when the others walked away from her? Like, why didn't she go with them instead of staying seated in that chair.

adrimit · Answer

she had no reason to follow them as they were trying to avoid her gas.

templeguy · Answer

@adrimit  Why did she say excuse me while chewing gum

templeguy · Answer

@madhu.mukherjee.946

adrimit · Answer

i didnt notice that she was chewing gum

templeguy · Answer

@adrimit  lol. When do you think she passed gas? Was it when the girl in pink was talking or something?

adrimit · Answer

after she said "i'm gonna walk in like the lady i is"

templeguy · Answer

@adrimit But the smell traveled to their noise right after she said that... so it traveled that fast?

adrimit · Answer

well I wouldn't say that the smell couldn't travel that fast. they were not that far away from each other...

templeguy · Answer

@adrimit Why did she say excuse me? She could've just kept quiet and not let the others know it was her

templeguy · Answer

@madhu.mukherjee.946

templeguy · Answer

@exploradora1011 Can you answer?

suenahelpz · Answer

Literally have never heard of humor class before...what even.