“A guy walks into a bar…” is a typical form of what has been called the “bar joke.” However, during the 2019–20 coronavirus pandemic, most bars were closed. The joke was:
   
“An Englishman, an Irishman and a Scotsman don’t walk into a bar.”
 
“An Englishman, Irishman and Scotsman don’t walk into a bar” was posted on Facebook by Jack Grainger on March 18, 2020. “An Englishman, an Irishman and a Scotsman don’t walk into a bar…” was posted on Twitter by Michael Gibson on March 21, 2020.
   
“An Englishman, a Scotsman and an Irishman walk into a bar…” is the original joke.
 
“A man doesn’t walk into a bar…,” “A man doesn’t walk into a pub…,” “A man walks into a bar, lucky bastard” and “An Englishman, an Irishman and a Scotsman walk into a bar. Those were the days” are related jokes.
 
   
Wikipedia: 2019-20 coronavirus outbreak
The 2019–20 coronavirus pandemic is an ongoing global pandemic of coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The outbreak was first identified in Wuhan, Hubei, China, in December 2019, and was recognised as a pandemic by the World Health Organization (WHO) on 11 March 2020.
     
Facebook 
Jack Grainger
March 18, 2020 ·
An Englishman, Irishman and Scotsman don’t walk into a bar.
 
Twitter 
Michael Gibson
@mikegibson2010
An Englishman, an Irishman and a Scotsman don’t walk into a bar…
9:34 AM · Mar 21, 2020·Twitter for iPhone
   
Twitter 
Gozer Goodspeed
@gozer_goodspeed
An Englishman, an Irishman and a Scotsman don’t walk into a bar
4:56 PM · Mar 22, 2020·Twitter for Android
 
Twitter
Euan
@euwotmate
A Scotsman, Englishman and Irishman don’t walk into a bar…
#COVIDー19 #Coronavirus #QuarantineAndChill
11:19 AM · Mar 23, 2020·Twitter for iPhone
 
Facebook
Euan Bryson
March 23, 2020 at 11:21 AM ·
A Scotsman, Englishman and Irishman don’t walk into a bar…
 
Twitter
Dave Bagnall
@djbsuffolk
As with most things the ‘a man walks into a bar’ joke is also feeling the effects of COVID-19 “An Englishman, Irishman and a Scotsman don’t walk into a bar instead they maintain the prescribed social distancing protocols - what a fine example of social responsibility.”
1:29 PM · Mar 23, 2020·Twitter Web App
 
Twitter
Phil Simmons OLY
@biffboff75
An Englishman, an Irishman and a Scotsman don’t walk into a bar.
4:45 AM · Mar 24, 2020·Twitter for Android
       
Facebook
Bob Carroll
March 27, 2020 at 9:40 AM ·
An Englishman, an Irishman and a Scotsman don’t walk into a bar.
 
Twitter
Andy Bitterer
@bitterer
A rabbi, a priest, and an Irishman don’t walk into a bar. 
OK.  I show myself out.
5:31 AM · Mar 30, 2020 from Hamburg, Germany·Twitter for iPhone
 
Twitter
Jake Lambert
@LittleLostLad
An Englishman, an Irishman and a Scotsman don’t walk into a bar :(
2:38 PM · Apr 6, 2020·Twitter for iPhone