“A guy walks into a bar…” is a typical form of what has been called the “bar joke.” A running version is:
 
“A runner walks into a bar. The bartender asks, ‘Why the long pace?’”
   
“Why the long pace”” is a pun on the famous “Why the long face?” punchline of the “A horse walks into a bar…” joke. “A marathon runner goes into a bar, the bartender asks: why the long pace?” was posted on Twitter on October 13, 2010.
 
     
Twitter
Chris Carlier‏
@Pubgoblin
A stilt walker comes into a bar. Barman says “Why the long pace?”
9:30 PM - 22 Apr 2010
   
Twitter
Superbuddha‏
@Superbuddha
A marathon runner goes into a bar, the bartender asks: why the long pace?
6:29 PM - 13 Oct 2010
 
Twitter
🌕‏
@derekmorecambe
A man strides into a bar,
The barman says “Why the long pace?”
7:09 AM - 4 Jul 2012
 
Twitter
Brandy Mc Fart‏
@Snikoggs
A marathon runner jogs into a Hausa bar.  The bartender goes. “Why the long pace?”
5:04 PM - 25 Oct 2012
 
Twitter
Allan Shaun Jones‏
@bigaljohonas
A man walks into a bar in one giant step
The barman says “Why the long pace?”
12:42 PM - 27 Dec 2012
   
Twitter
Arnie Haybridge‏
@ArnieHaybridge
A marathon runner walks into a bar and the barman says…why the long pace?
5:40 PM - 10 Aug 2017
 
Reddit—Jokes
A runner walks into a bar
submitted November 4, 2017 by CRGRO
The bartender says: why the long pace?