“Every teacher before they draw on the board: ‘I’m not an artist’”

Teachers often draw on boards to explain ideas, and there’s a jocular line:
 
“Every teacher before they draw on the board: ‘I’m not an artist.’”
 
The line was cited on tumblr and went viral on Twitter on March 30, 2012. The saying has been printed on several images.
   
 
ethische-abstumpfung—tumblr
every teacher before they draw on the board:  im not an artist
 
Twitter
Chris
‏@blaaaaaine
Overheard: every teacher before they draw on the board: im not an artist http://tmblr.co/ZGYJ6xIpvCxN
7:46 PM - 30 Mar 2012
 
Twitter
lil dub
‏@atrociousasi
every teacher before they draw on the board: “im not an artist”
7:47 PM - 30 Mar 2012
 
Twitter
old account
‏@L1LDEEPTHROAT
every teacher before they draw on the board: im not an artist
7:48 PM - 30 Mar 2012
 
Witty Profiles
Funny Quote #5553436
GABTASTIC_
posted April 19, 2012 at 4:27pm EDT
every teacher before they draw on the board: i’m not an artist
     
Facebook
LGS EME
May 27, 2013 ·
Every teacher before they draw on the board: “I’m not an artist.”
 
Lazy Kat
26 MARCH 2014
EVERY TEACHER BEFORE THEY DRAW ON THE BOARD : I’M NOT AN ARTIST.