“A guy walks into a bar…” is a typical form of what has been called the “bar joke.” A synonym version is:
 
“A synonym strolls into a tavern.”
   
The joke was posted on Twitter by Lori M on July 2, 2012.
 
         
Twitter 
Lori M
@PokerVixen
Replying to @absinthetics
@absinthetics A synonym strolls into a tavern.
12:02 AM - 2 Jul 2012
   
Twitter
John Bergin
@theburgerman
Replying to @perrynfowler
.@perrynfowler @NewtonMark A synonym strolls into a tavern.
11:42 PM - 29 Jun 2013
 
Language Matters
Saturday, September 20, 2014
Updated Humour for Intelligent People
(...)
13, A synonym strolls into a tavern.
     
Legible
A legal-writing teacher walks into a bar . . .
This entry was posted in Humor on January 15, 2016.
(...)
A synonym strolls into a tavern.
 
Google Groups: Dicta
After bad new, a few things to make us smile
anna.durbin
02/26/18
(this was shared by my fellow English major classmate.)  But RIP, Susan.  We miss you.
(...)
A synonym strolls into a tavern.
 
Reddit—Writing
A dangling participle walks into a bar… (self.writing)
submitted March 10, 2018 by Pale_King101
(...)
A synonym strolls into a tavern.
 
14 March 2018, The Mercury (Durban, South Africa), “‘Twas at a gathering of the clans,” pg. 19:
A synonym strolls into a tavern.
 
Reddit—Dad Jokes
A synonym strolls into a tavern (self.dadjokes)
submitted March 25, 2018 by abevlar