“Instant asshole—just add alcohol” is a saying that has been printed on many images. “The buttons have sayings on them: ‘Are We Having Fun Yet?’ ‘Instant Asshole…Just Add Alcohol’” was cited in a 1988 book. “There is a popular bumper sticker that reads: ‘Instant Jerk, Just Add Alcohol’” was cited in 1990.
 
“Instant jackass—just add alcohol” is a saying that has been printed on many shot glasses. “My wife once bought a shot glass for me that said: ‘Instant Jackass, Just Add Alcohol’” was cited on Twitter on January 31, 2010.
     
“Instant human—just add coffee” is a similar saying.
 
       
Google Books
All You Can Eat: Stories
By Robin Hemley
New York, NY: Atlantic Monthly Press: Distributed by Little, Brown
1988
Pg. 151:
The buttons have sayings on them: “Are We Having Fun Yet?” “Instant Asshole . . . Just Add Alcohol,” ...
 
6 October 1990, Los Angeles (CA) Times, “Bad Things Brewing at Raider Games,” pg. 3:
There is a popular bumper sticker that reads: “Instant Jerk, Just Add Alcohol.” I feel this bumper sticker explains the problems rowdy Raider fans are causing.
   
Google Books
Last Places:
A Journey in the North
By Lawrence Millman
New York, NY: Vintage Books
1992
Pg. 208:
A man with a powerful beer breath and a cap that said Instant Asshole . . . Just Add Alcohol came up to me and, sticking a hard finger in my chest, asked me what I was doing in Sheshashui.
 
Google Books
I Check the Mail Only when Certain it Has Arrived:
A Collection of Letters from People I Didn’t Know, 1986-1994
By Andy Jenkins
San Pedro, CA: Bend Press
1995
Pg. 76:
Instant ASSHOLE, Just Add Alcohol.
 
9 October 2005, The Capital (Annapolis, MD), “Readers’ views,” pg. A13, col. 1:
As I glanced to either side of these shirts, I was greeted by “Show me your (breasts)!” and “Instant (rectum), just add alcohol” (or in this case, a bit of cotton and a decal).
 
What kind of family would wear these shirts proudly?
(...)
TED DALY
Arnold
 
Twitter
Greg Burkman
‏@gregburkman
Instant asshole… just add alcohol
3:49 AM - 13 Jun 2009
 
Twitter
Brew York
‏@brew_york
My friend Crosby owned a shirt that said, “Instant Asshole: Just Add Alcohol.” I think that just about describes everyone here right now.
12:32 AM - 10 Jul 2009
 
Twitter
Steve Jones
‏@finkystingers
My wife once bought a shot glass for me that said: “Instant Jackass, Just Add Alcohol.” Now, I don’t even need alcohol to be a jackass.
10:24 AM - 31 Jan 2010
 
Twitter
josephine .
‏@josephinegyamfi
“Instant Jackass. Just add alcohol” LOL i lovee itt ! Thaanks for the shot glass @SkittlesFLady 😊 LOVE YOU!
2:00 PM - 22 Mar 2010
 
Twitter
Tamara
‏@YouAreFIERCE
#MOMism : Instant jackass… just add wine http://mommagazine.ca
5:01 PM - 12 May 2010
 
Twitter
Ashlee Tessier
‏@Ashlee_Tessier
“instant jackass, just add beer!”
4:22 PM - 4 Jul 2011
 
Google Books
Instant Idiot Just Add Alcohol
Sonny Carbo
Page Publishing Inc, Apr 24, 2014 - Biography & Autobiography - 114 pages
They say that the choices one makes and the mistakes that have been made can very well define a man and how he has lived his life. But then how do you describe the life of a man who has done nothing but mistakes and has let his vices and addictions run his life?
 
Panama City (FL) News Herald
Outdoors: Safe boating should be every week
By SCOTT LINDSEY
Posted May 28, 2016 at 3:11 PM
Updated May 28, 2016 at 3:13 PM
(...)
Maybe you’ve heard the old saying about the fellow who had a ball cap with the logo “Instant jackass just add alcohol.”