“You should eat a waffle! You can’t be sad if you eat a waffle!” has been printed on GIFs. American author Lauren Mracle wrote in ttfn (2006), a young-adult novel about instant messaging among high school students:
 
mad maddie: u should go eat a waffle! u can’t be sad if u eat a waffle!!!
 
“You should eat a waffle! You can’t be sad if you eat a waffle!” is a saying that has been promoted by some waffle shops and that has been popular on Waffle Day (March 25th in Sweden and many other countries, but August 24th in the United States).
 
   
Wikipedia: Lauren Myracle
Lauren Myracle (born May 15, 1969) is an American writer of young-adult fiction. She was born in Brevard, North Carolina and is the oldest of three sisters and has three older brothers. She grew up in Atlanta, Georgia where she attended Trinity School and The Westminster Schools. Myracle earned a BA in English and Psychology from University of North Carolina at Chapel Hill where she was inducted into Phi Beta Kappa. After that, she worked for some time as a middle-school teacher in Gwinnett County, Georgia and participated in the JET Programme in Japan. Myracle later earned an MA in English from Colorado State University, where she taught for two years and an MFA in Writing for Children and Young Adults from Vermont College.  She has written many novels, including the three best-selling “IM” books, ttyl, ttfn and l8r, g8r.
   
Wikipedia: ttfn (novel)
ttfn is a young adult novel by Lauren Myracle. Published by Harry N. Abrams, Inc. in 2005, it is the sequel to ttyl, and is also written entirely in the style of instant messaging conversation. It is followed by l8r, g8r.
 
The book reached number 4 on the New York Times Best Seller list for children’s chapter books in March 2006.
 
This novel follows Maddie (“MadMaddie”), Zoe (“ZoeGirl”), and Angela (“SnowAngel”) through the ups and downs of their junior year.
   
Google Books
ttfn
By Lauren Myracl
New York, NY: Amulet Books
2006
Pg. ?:
mad maddie:
u should go eat a waffle! u can’t be sad if u eat a waffle!!!
 
Twitter
Kay Ranft
‏@kayranft
“You should eat a waffle! You can’t be sad if you eat a waffle!”— Lauren Myracle (this is so true-specially if they are blueberry waffles)
2:27 PM - 16 Oct 2009
 
Twitter
Vicky
‏@AllTimeVickie
If ur sad, u should go eat a waffle! you can’t be sad if u eat a waffle! -wise words from madmaddie; ttyl
10:10 PM - 30 Nov 2009
 
Facebook
Bara Ebba
June 7, 2013 ·
“You should eat a waffle! You can’t be sad if you eat a waffle!”
 
Latin Times
International Waffle Day Quotes: 10 Sayings About The Best Breakfast There Ever Was
By Paloma Torres | Mar 25 2014, 01:27PM EDT
(...)
3.  “You should eat a waffle! You can’t be sad if you eat a waffle!”—Lauren Myracle
 
Facebook
Waffle Shoppe
May 21, 2014 ·
You should eat a waffle! You can’t be sad if you eat a waffle!