Above, a 1934 plaque from the Big Apple Night Club at West 135th Street and Seventh Avenue in Harlem. Discarded as trash in 2006. Now a Popeyes fast food restaurant on Google Maps.

Entry from April 16, 2016
“Two random variables were talking in a bar…” (bar joke)

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

“Two random variables were talking in a bar. They thought they were being discrete, but I heard their chatter continuously.”

The joke was cited on reddit and was first cited on Reddit—Statistics and Twitter on May 7, 2013.

Reddit—Statistics
armchairdetective May 7, 2013
Not really a joke, but it makes me laugh hysterically:
Two random variables were talking in a bar. They thought they were being discrete but I heard their chatter continuously.

Two random variables were talking in a bar. They thought they were being discrete but I heard their chatter continuously. (from reddit)
11:15 AM - 7 May 2013

13 Jokes That Every Math Geek Will Find Hilarious
Walter Hickey
May 21, 2013, 5:38 AM
(...)
JOKE #2
Two random variables were talking in a bar. They thought they were being discrete but I heard their chatter continuously.
Source: armchairdetective /  reddit

Explanation: When you roll a die, you either get a 1, 2, 3, 4, 5, or 6. Since there are a finite number of possibilities, the statistic involved is called a discrete random variable. When you select any real number from between 0 and 1, there are an infinite number of possible draws. The statistic involved is called a continuous random variable.

Chetan Mitta
‏@ChetanReddy
“Two random variables were talking in a bar. They thought they were being discrete but I heard their chatter continuously”- #Reddit #Nerd
8:48 AM - 21 May 2013

Calculus Humor
Random Variables
8/12/2013
(...)
Explanation: When you roll a die, you either get a 1, 2, 3, 4, 5, or 6. Since there are a finite number of possibilities, the statistic involved is called a discrete random variable. When you select any real number from between 0 and 1, there are an infinite number of possible draws.

Calculus
November 2, 2015 ·
Two random variables were talking in a bar. They thought they were being discrete but I heard their chatter continuously.

Comedy Writing Secrets:
The Best-Selling Guide to Writing Funny and Getting Paid for It (Third Edition)

By Mark Shatz and Mel Helitzer
Blue Ash, OH: Writer’s Digest Books
2016
Pg. 212:
Another safe target is academic subject matter. It’s highly doubtful that the following math jokes will trigger PC alarms.

Two random variables were talking in a bar. They thought they were being discrete, but I heard their chatter continuously.

Reddit—Jokes
Two random variables were talking in a bar
submitted August 21, 2016 by Kenzlea
They thought they were being discrete but I heard them continuously.

Oxford Maths‏
@OxfordEdMaths
Two random variables were talking in a bar. They thought they were being discrete but I heard their chatter continuously #FridayJoke
11:30 AM - 21 Jul 2017

Reddit—Jokes
Two random variables were talking in a bar…
submitted July 30, 2017 by TheHickoryDickoryDoc
They thought they were being discrete, but I could hear their chatter continuously.

Posted by Barry Popik
New York CityRestaurants/Bars/Coffeehouses/Food Stores • Saturday, April 16, 2016 • Permalink

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