“A guy walks into a bar…” is a typical form of what has been called the “bar joke.” a minimalist version is simply:
   
“A minimalist walks into a bar.”
   
“A minimalist walks into a bar. the end” was posted on Twitter by John Cullen ☕Books on December 5, 2009. “A minimalist walks into a bar” was posted on Twitter by Rajkumar Devjani on July 3, 2011.
   
     
Twitter
John Cullen ☕Books
@jcvsmc
A minimalist walks into a bar. the end.
3:16 PM · Dec 5, 2009·Twitter Web Client
   
Twitter
Rajkumar Devjani
@rajkumardevjani
A minimalist walks into a bar.
12:31 PM · Jul 3, 2011·Twitter for BlackBerry®
 
Twitter
Karl Sharro***** ***** ***** ****
@KarlreMarks
So a minimalist walks into a bar.
8:30 AM · Nov 24, 2012·Twitter for BlackBerry®
 
Twitter
Callum Flack
@callumflack
“So a minimalist walks into a bar.” http://zenpundit.com/?p=28630
10:28 PM · Oct 8, 2013·Twitter for Websites
   
Twitter
Simon Levy
@cyartes
A statistician walks into a bar chart…
A minimalist walks into a bar…
That’s it.
#BBCRadio4Humour
10:54 AM · Jul 15, 2014·Twitter for Android
   
Twitter
gogo lo
@g_lo1976
A minimalist walks into a bar….nothing happened…
10:56 AM · Jul 15, 2014·Facebook
 
Google Books
And Then God Created the Middle East and Said ‘Let There Be Breaking News’
By Karl reMarks
Saqi Books,
2018
Pg. ?: 
A minimalist walks into a bar.
 
Twitter
Hannah
@Pi_In_The_Sky
“A minimalist walks into a bar.”
1:16 PM · Jan 4, 2018·Twitter for iPhone
 
Twitter
Geoff Holland
@geoffholland
Replying to @jaketapper
A minimalist walks into a bar.
12:44 PM · Jun 21, 2020·Twitter for iPhone