“A guy walks into a bar…” is a typical form of what has been called the “bar joke.” A chess version is:
 
“A bishop walks straight up to the bar and the barman says, ‘You can’t do that. Bishops can only move diagonally.’”
 
The joke was posted on Reddit on July 2, 2016.
 
A different version had been posted on Twitter on October 21, 2015:
 
“A king and a bishop walk into a bar. Barman says to the king: ‘I can’t serve your mate. He can’t walk straight.’”
 
 
Twitter
Laura M
‏@lkmonmoth
@ThePoke #WalksIntoABar
A king and a bishop walk into a bar.
Barman says to the king: “I can’t serve your mate. He can’t walk straight”.
4:03 AM - 21 Oct 2015  
     
reddit
A bishop walks straight up to the bar and the barman says
submitted July 2, 2016 by disneysucks
You can’t do that. Bishops can only move diagonally.
 
Facebook
Graham Kenneth Short
July 5 at 12:58pm · Croxdale, United Kingdom ·
A Bishop goes into a bar and walks straight up to the barman.
“Oi!” Says the barman, “you can’t do that! Bishops are only supposed to move diagonally!”
 
The Amazingly Lame Joke of the Day
Sunday, July 10, 2016
A bishop walks into a bar and walks straight up to the bartender.
The bartender says, “You can’t do that. Bishops can only move diagonally.”
Posted by Tim Wycislak at 7:50 AM
 
Twitter
W
‏@WWarped
A bishop walks into a bar, he walks straight up to the bartender. The bartender says, “You can’t do that. Bishops can only move diagonally.”
11:43 AM - 10 Jul 2016
 
Twitter
LaffGaff
‏@LaffGaff
A Bishop walks straight to the bar.
The bartender says, “You can’t do that. Bishops are only allowed to move diagonally.”
#funny
4:12 PM - 10 Jul 2016