“A guy walks into a bar...” is a typical form of what has been called the “bar joke.” A book version is:

“A book walks into a bar. The bartender says, ‘Please, no stories!’”

The joke has been cited in print since at least 2008.


Corrente
A book walks into a bar.
Submitted by Truth Partisan on Fri, 09/12/2008 - 6:21pm
A book walks into a bar. The bartender says, “Please, no stories!”

Loosening Up, Letting Go & Learning to Live Again
FRIDAY, OCTOBER 17, 2008
Send the Hate Mail
(...)
A book walks into a bar. The bartender says, “Please, no stories!”

Google Books
The Best ‘A Man Walks Into A Bar’ Jokes
By Billy Brownless
Crows Nest NSW: Allen & Unwin
2009
Pg. 14:
A book walks into a bar. The bartender says, ‘Please, no stories!

Twitter
mnboater
‏@mnboater
@jshults LOL!  Here’s one. A book walks into a bar. The bartender says, “Please, no stories!”
1:31 PM - 17 Mar 2009

Twitter
Celebrity Monkey
‏@CelebrityMonkey
A book walks into a bar. The bartender says, “Please, no stories!” as he kick his ass out into the street.
9:40 PM - 22 Apr 2009

Twitter
manwalksintobar
‏@manwalksintobar
#manwalksintobar A book walks into a bar. The bartender says, “Please, no stories!”
8:10 AM - 24 May 2009

Google Groups: WANAKENYA
Re: [PK] ON A SERIOUS NOTE THOUGH
Kuria-Mwangi
12/28/12
(...)
Q: What did the bartender say after a book walked into the bar? A: “Please, no stories!”