“I don’t know what it is, but it’s on sale!”

“I don’t know what it is, but it’s on sale!” is a shopping saying that has been printed on many images. “I don’t know what it is, but it’s on SALE - BUY IT” was posted on Twitter by “Dave. Just Dave.” on April 7, 2009.
 
   
Twitter 
Dave. Just Dave.
@davidwhittam
@MmmBaileys I don’t know what it is, but it’s on SALE - BUY IT.
8:39 AM · Apr 7, 2009·Twitter Web Client
 
Twitter 
Ysatis ♡
@typicalYsah
I don’t know what it is but it’s ON SALE! #BlackFriday
4:43 PM · Nov 23, 2012·UberSocial for BlackBerry
   
Twitter
Ed Hill
@kingedhill
“I DON’T KNOW WHAT IT IS. BUT IT’S ON SALE.” -every shopper on Black Friday. #blackfriday
12:36 AM · Nov 25, 2012·Twitter for iPhone
 
Twitter
Brent Almond
@DesignerDaddy
#DooDadoftheDay: I don’t know what it is, but it’s on sale (& all #StarWars toys) tomorrow 5/4! Promo code in link!
http://fb.me/2xV8LJPu4
4:18 PM · May 3, 2013·TweetDeck
 
Twitter 
Bershka
@Bershka
I don’t know what it is, but it’s on sale 😂 - real talk on sale season
5:40 PM · Jul 4, 2018·Twitter for iPhone
     
Courier Journal (Louisville, KY)
Louisville shoppers wake up before dawn for Black Friday discounts
Billy Kobin, Louisville Courier Journal Published 6:58 a.m. ET Nov. 23, 2018 | Updated 8:49 a.m. ET Nov. 23, 2018
(...)
Pam Rice, from Louisville, has taken advantage of Black Friday deals for several years. Rice and her daughter Grace were outside the H&M store at Oxmoor at 6 a.m. to get early shopping done and to check out the crowds. They even made black shirts this year with white lettering: “I don’t know what it is but it’s on sale.”
 
Twitter
Jaime 🏹🦌🦃🐗 🎄🤶🏽🎅🏼🎄
@Treestand_tweet
I don’t know what it is but, it’s on sale…Somebody is getting it for Christmas 🎄🤶🏽🎅🏼
5:51 PM · Dec 20, 2018·Twitter for iPad
     
Elite Daily
30 Instagram Captions For Black Friday That You Shouldn’t Pass Up On
BY RACHEL CHAPMAN
UPDATED: NOV 22, 2019
(...)
12. “I don’t know what it is, but it’s on sale.”
 
Twitter
Trent Tidwell
@thecon24
I don’t know what it is but, it’s on sale.
9:22 AM · Nov 29, 2019·Twitter for iPhone