“A guy walks into a bar…” is a typical form of what has been called the “bar joke.” A popular form of the joke is:
 
“Two fonts walk into a bar. The barman says to them, ‘Get out. We don’t serve your type here.’”
 
The joke has been cited in print since at least December 2000, when it was credited to Lorraine Bellis. “A default sans-serif font” is a frequently told form of the joke.
 
   
Yahoo! Groups: Puns of the Day
Stan Kegel
Dec 5, 2000
Puns of the Day: 12/5/00
(...)
Two fonts walk into a bar. The barman says to them, “Get out. We don’t serve your type here.” (Lorraine Bellis)
     
HUMOR Digest
Date:  Sat, 9 Dec 2000 23:18:37 -0800
From:  Stan Kegel

Subject: “Puns of the Weak” 12/08/00
(...)
•Two fonts walk into a bar. The barman says to them, “Get out. We don’t serve your type here.” (Lorraine Bellis)
     
Google Groups: novell.community.chat
No Warning
Felton Green
12/10/00
Two fonts walk into a bar. The barman says to them, “Get out. We don’t serve your type here.” (Lorraine Bellis)
 
Google Groups: free.uk.life.inner-city
A GOOD PLOD IS A DEAD PLOD!
Hidehi
12/27/00
(...)
That reminds me.  Two fonts walk into a bar and ask for a drink, the barman refuses to serve them, ‘Why?’ asks one of the fonts, the barman replies ‘Because we don’t serve your type in here’
     
MetaFilter
A set of fonts walks into a bar.
Barman: Sorry, we don’t want your type in here.
posted by Mocata at 9:59 AM on December 20, 2001
 
Google Books
Man Walks into a Bar:
Over 6,000 of the Most Hilarious Jokes, Funniest Insults and Gut-Busting One-Liners
By Stephen Arnott and Mike Haskins
Berkeley, CA: Ulysses Press
2007
Pg. 115:
A group of fonts walk into a bar. “Get out of my bar!” shouts the bartender. “We don’t serve your type in here.”
 
Google Books
The Everything Bartender’s Book:
750 recipes for classic and mixed drinks, trendy shots, and non-alcoholic alternatives!
By Cheryl Charming
Avon, MA: Adams Media
2007
Pg. 214:
Four fonts walk into a bar and the barman says, “Get out! We don’t want your TYPE in here!”
 
Twitter
R. Sowards-Emmerd
‏@calipidder
#jokes A default Sans Serif font walks into a bar. The bartender says, “Sorry, we don’t serve your type here.”
12:30 PM - 28 Jul 2008
 
Google Books
Ultimate Book of Jokes:
The Essential Collection of More Than 1,500 Jokes
By Scott McNeely
San Francisco, CA: Chronicle Books
2011
Pg. ?:
A sans serif font walks into a bar. The bartender says, “Sorry, we don’t serve your type here.”
 
Google Books
The Mammoth Book of One-Liners
By Geoff Tibballs
London: Constable & Robinson Ltd.
2012
Pg. ?:
Two fonts walk into a bar. The bartender says: “Sorry, we don’t want your type in here.”