“A guy walks into a bar…” is a typical form of what has been called the “bar joke.” A Freudian version is:
 
“An ego and a superego walk into a bar. The bartender says, ‘I’m going to need to see some id.’”
 
The joke was posted on Twitter by “Matt” on May 26, 2011 and has been printed on several images.
 
   
Wikipedia: Id, ego and super-ego
Id, ego, and super-ego are the three parts of the psychic apparatus defined in Sigmund Freud’s structural model of the psyche; they are the three theoretical constructs in terms of whose activity and interaction our mental life is described. According to this model of the psyche, the id is the set of uncoordinated instinctual trends; the super-ego plays the critical and moralizing role; and the ego is the organized, realistic part that mediates between the desires of the id and the super-ego. The super-ego can stop one from doing certain things that one’s id may want to do.
 
Twitter 
matt
‏@biorhythmist
Ego and super-ego walk into a bar. Bartender says “I’m gonna need to see some id.”
9:12 AM - 26 May 2011
 
Twitter
The Red Witch
‏@theredwitch
Fucking Hilarious! RT @biorhythmist: Ego and super-ego walk into a bar. Bartender says “I’m gonna need to see some id.”
9:17 AM - 26 May 2011
 
Twitter
Helen Saxon
‏@helensaxon
Clever… RT @jasonhesse: RT @biorhythmist: Ego and super-ego walk into a bar. Bartender says “I’m gonna need to see some id.”
9:27 AM - 26 May 2011
   
Google Groups: hr.rec.humor
Freud
4 assa
6/18/11
(...)
Ego and super-ego walk into a bar. Bartender says “I’m gonna need to see some itd.”
 
Twitter
Alex Goldberg ⚗
‏@AlexFGoldberg
ego and superego walk into a bar
bartender says “i’m gonna have to see some id”
9:00 PM - 26 Dec 2015
 
Reddit—Jokes
Ego and Super Ego walk into a bar.
submitted January 8, 2016 by reeeeeeeeeeeeeeeed
Bartender says, “I’m going to need to see some Id.”
 
Reddit—Jokes
An ego and a superego walk into a bar.
submitted February 22, 2017 by -Karyete-
The bartender says “I’ll have to see some id”