“A bar walks into a commutative algebraist” (bar joke)

“A guy walks into a bar…” is a typical form of what has been called the “bar joke.” A math version is:
   
“A bar walks into a commutative algebraist”
   
The joke was posted on Twitter by brocialist reply guy on August 20, 2008.
 
 
Wikipedia: Commutative algebra
Commutative algebra is the branch of algebra that studies commutative rings, their ideals, and modules over such rings. Both algebraic geometry and algebraic number theory build on commutative algebra. Prominent examples of commutative rings include polynomial rings; rings of algebraic integers, including the ordinary integers {\displaystyle \mathbb {Z} }\mathbb {Z} ; and p-adic integers.
 
Twitter
brocialist reply guy
@sick_riff_dude
A bar walks into a commutative algebraist
11:01 AM · Aug 20, 2008·Twitter Web Client
     
Google Books
The Best ‘A Man Walks Into a Bar’ Jokes
By Billy Brownless
London, UK: Allen & Unwin
2009
Pg. 5:
A BAR WALKS INTO A COMMUTATIVE algebraist.
 
Google Groups: pun-ctilious
The Parable of poor Polly Nomial
logik
11/26/09
(...)
A bar walks into a commutative algebraist.
 
Twitter
Roger Guldbrandsen
@kinbiko
So… A bar walks into a commutative algebraist…
*giggles*
8:42 AM · Jul 2, 2012·Twitter Web Client
 
Twitter
Drake Akens
@DrakeQRandom
A bar walks into a commutative algebraist.
7:10 AM · Dec 11, 2013·Twitter Web Client
 
Twitter
Algonquin K Farquhar, Esq
@buddhatree
A bar walks into a commutative algebraist.
9:59 PM · Dec 9, 2014·Twitter Web Client