“A guy walks into a bar...” is a typical form of what has been called the “bar joke.” There are several jokes about two or three men walking into a bar and ducking (or not ducking). The following joke is from 1990:

“These two guys walk into a bar,, You think that the second one would have ducked......”

This joke is from 1993:

“Three men walking down the street, two walk into a bar - the third ducked.”

“Two blondes walk into a building. You’d think one of them would have seen it” is a variation on the bar joke.


Google Groups: alt.stupidity
Knock Knock
Liam G Curry
11/28/90
In article , weinrich@orchestr>
> “A man walks into a bar and says ‘ouch!’”

These two guys walk into a bar,, You think that the second one would have ducked......

Google Groups: rec.humor
bar joke
Wally Thomson
2/4/93
(...)
Three men walking down the street, two walk into a bar - the third ducked. 

Google Groups: rec.humor
a shorter, funnier joke!!
Alan Wilson
12/10/93
(...)
Two men walk into a bar. You’d think the second one would have seen it.

JANINE O. JOHN
12/16/93
(...)
Two men walk into a bar… the third one ducked…

Google Groups: rec.puzzles
A Man Walks into a Bar
Dana Carroll
11/15/94
(...)
Three men walk into a bar.  You’d think one of them would have ducked!

Google Groups: rec.humor
Horse walks into a bar......
Wesley F Wright
2/23/95
(John Wiswell) wrote:
>Horse walks into a bar
>
>Bartender says....” Why the long face?”

Two guys walk into a bar.
The third one ducked.

Google Groups: rec.humor
Two men walk into a bar…
recyc...@null.microsoft.com
10/24/96
Two men walk in to a bar.
You’d think the other one would have ducked…

Google Groups: rec.humor
Three guys walk into a bar…
King of All Windbags
1/30/97
...the fourth one ducked.

Google Groups: alt.tasteless.jokes
2 men walk into a bar
paul r morin
5/24/97
2 men walked into a bar,
second one should’ve ducked!

Google Books
Funny Boy Takes on the Chitchatting Cheeses from Chattanooga
By Don Gutman
New York, NY: Hyperion Book
2000
Pg. 28:
“Okay, these two guys walk into a bar. You’d think the second one would have ducked.”

Google Books
Guy Walks Into A Bar...:
501 Bar Jokes, Stories, Anecdotes, Quips, Quotes, Riddles and Wisecracks
By Michael Lewis
New York, NY: Black Dog & Leventhal Publishers, Inc.
2005
Two guys walk into a bar. You d think the second guy would have ducked.

Google Books
Waiting for War
By James Brokaw, 3rd
Hedgie Press
2011
Pg. ?:
“Like this: Two men walk into a bar. You’d think the second one would have ducked.”

Twitter
Smike
‏@SmikeTV
Three men walk into a bar. You’d think the third man would’ve ducked.
1:12 PM - 13 Oct 2015

Twitter
David Aronoff
‏@dba
Two men walk into a bar. The third one ducked. #badcleanjokes
12:58 PM - 24 Oct 2015