“A guy walks into a bar…” is a typical form of what has been called the “bar joke.” A non sequitur version is:
 
“A non sequitur walks into a bar. In a strong wind, even turkeys can fly.”
     
“A non sequitur walks into a bar. The bartender says, ‘What’s that on your head, pal?’ The non sequitur says, ‘How do I get to the highway?’” was posted on Twitter on February 16, 2009. “A non sequitur walks into a bar and asks for a horse” was posted on Twitter on August 23, 2012.
 
“A non sequitur walks into a bar. In a strong wind, even turkeys can fly” was posted on Language Matters on September 20, 2014. (This date may be incorrect.) However, the joke went viral in February 2018.
   
       
Twitter
Lamar Henderson
@lamarhenderson
A non sequitur walks into a bar. The bartender says, “What’s that on your head, pal?” The non sequitur says, “How do I get to the highway?”
3:52 PM - 16 Feb 2009
   
Twitter
David
@CaptainLimey
A non sequitur walks into a bar and asks for a horse.
4:07 AM - 23 Aug 2012
 
Language Matters
Saturday, September 20, 2014
Updated Humour for Intelligent People
(...)
8. A non sequitur walks into a bar. In a strong wind, even turkeys can fly.
   
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 non sequitur walks into a bar. In a strong wind, even turkeys can fly.
   
Twitter
PolPhD
@PhDMayors
A non sequitur walks into a bar. In a strong wind, even turkeys can fly.
3:45 PM - 27 Feb 2018
 
Reddit—Writing
A dangling participle walks into a bar… (self.writing)
submitted March 10, 2018 by Pale_King101
(...)
A non sequitur walks into a bar. In a strong wind, even turkeys can fly.
 
14 March 2018, The Mercury (Durban, South Africa), “‘Twas at a gathering of the clans,” pg. 19:
A non sequitur walks into a bar. In a strong wind, even turkeys can fly.