There is powerful ziggatry at work here.

@klystron2010  
That’s a cheeky joke I can 100% get behind.

But she already beat Sunset several movies ago.

@Ping_chan  
To be fair, ascertaining the exact THICCness of dat striped plot is indeed a noble goal.

You know, I’ll actually try defending Twi here that she actually isn’t being racist or cruel…  
I’ll bet you she is actually trying out different sized books to try to come up with a standardized method for judging the T H I C C rating for plots.  
Just look at the Matriarch’s face here, she isn’t upset or offended, she has a look of concern.  
She wants to help Twi find a accurate and scientific way to best rank plots.  
I’ll bet they will also come up with good health and fitness plan for anyone who has a lacking plot that does not meet standards, like improving diet and lots of squats or something…

I told you Equestria is racist. How long has she been there, and the authorities are already booking her!

Bookjob?  
or  
Bookbump?

Needs little “boing” sound effects.

@Revan-Seiei
 
The secret is squats.

Perhaps Twilight is trying to ascertain the secrets of the Glorious Zebra Butt.

Twilight what are you doing?

twi Gonna get kicked :0

Dude, this horse slaps.

Twilight. What you doing? Twilight. Stahp.

Wonder what Twi seeks to accomplish here. Is she testing the thickness of Zeg’us’ plot, or is she trying to shoo her away?

Thicker than a snicker

Is that a book?

I don’t get it.

Aryanne would hate her. The zebras are her allies.