“A guy walks into a bar…”  is a typical form of what has been called the “bar joke.” A deer version is:
 
“Two deer walk out of a gay bar. One turns to the other and says, ‘I can’t believe I just blew 30 bucks in there.’”
 
The joke was posted on Reddit and Twitter on March 22, 2011 and has been printed on several images.
 
 
Reddit
Two deer walk out of a gay bar… (self.funny)
submitted March 22, 2011 by ngtstkr
...one turns to the other and says “I can’t believe I just blew 30 bucks in there.”
 
Twitter
inkubux
‏@inkubux
Two deer walk out of a gay bar…
...one turns to the other and says “I can’t believe I just blew 30 bucks in there.”
1:22 PM - 22 Mar 2011
 
Twitter
Suzie Robb
‏@suzierobb
two deer walk out of a gay bar, one turns to the other and says “I cant believe i blew 30 bucks in there”
2:19 PM - 22 Mar 2011
   
HuntingNY.com
burmjohn
Posted October 28, 2011
Two deer walk out of a gay bar…
...the one deer turns to the other and says “I can’t believe I just blew 30 bucks in there.”
 
Reddit
Two deer walk out of a gay bar
submitted January 9, 2013 by JoshTheDerp
One deer turns to the other and says “I can’t believe I blew 30 bucks in there”
 
LurkerFAQs
ActionBenton | Posted on Oct. 24, 2013, 8:13 p.m.
one looks at the other and says
“wow i can’t believe i blew thirty bucks in there”
   
Reddit
Two deer walk out of a gay bar…
submitted February 10, 2016 by PM_ME_YOUR_GINGER
One of them turns to the other and says “I can’t believe I blew thirty bucks in there”
 
Reddit
Two Deer walk out of a gay bar…
submitted November 22, 2016 by Arrentwan
One Deer turns to the other and says “I can’t believe I blew 30 bucks in there”