“A horse walks into a bar and says, ‘On a right-angled triangle with side X, Y, and Z…’” (bar joke)

“A guy walks into a bar…”  is a typical form of what has been called the “bar joke.” A Pythagorean theorem version is:
 
“Pythagoras walks into a bar and says, ‘Which one is the hypotenuse?’ The barman says, ‘Y, the long face.’”
 
This is based on the famous bar joke, “A horse walks into a bar and the barman says, ‘Why the long face?’”
 
“Pythagoras walks into a bar muttering, ‘If a right-angled triangle has a short side, X, a long side, Y, and hypotenuse, Z, then the square of Z must be equal to the sum of the square of X and the square of, erm… uh…’ The barman says, ‘Y, the long face?’” was posted on Reddit—Jokes on October 15, 2012. “A Geometry student walks into a bar. The barman asks ‘y, the long face?’” was posted on X/Twitter by Pundamentalism on September 6, 2013.
 
“A horse walks into a bar and asks the bartender ‘On a right-angled triangle with the sides X, Y and Z, if X and Z are perpendicular, which side is opposite to the right angle?” The bartender responds ‘Y, the long face?’” was posted on Reddit—Jokes on November 17, 2016. “Pythagoras walks into a bar and says ‘Which one is the Hypotenuse?’ The Barman says ‘y, the long face’” was posted on Facebook by Stephen Gould on February 14, 2021.
 
   
Wikipedia: Pythagorean theorem
In mathematics, the Pythagorean theorem or Pythagoras’s theorem is a fundamental relation in Euclidean geometry between the three sides of a right triangle. It states that the area of the square whose side is the hypotenuse (the side opposite the right angle) is equal to the sum of the areas of the squares on the other two sides.
(...)
The theorem is named for the Greek philosopher Pythagoras, born around 570 BC.
 
Reddit—Jokes
SeniorDiscount—October 15, 2012
Pythagoras walks into a bar.
Pythagoras walks into a bar muttering, “If a right-angled triangle has a short side, X, a long side, Y, and hypotenuse, Z, then the square of Z must be equal to the sum of the square of X and the square of, erm… uh…”
The barman says, “Y, the long face?”
 
Facebook
Satan
October 20, 2012 at 9:25 AM ·
Pythagoras walks into a bar muttering, ‘If a right-angled triangle has a short side, X, a long side, Y, and hypotenuse, Z, then the square of Z must be equal to the sum of the square of X and the square of, erm… uh…’
The barman says, ‘Y, the long face?’
 
X/Twitter
Pundamentalism
@Pundamentalism
A Geometry student walks into a bar. The barman asks “y, the long face?”.
4:09 AM · Sep 6, 2013
 
Reddit—Jokes
[deleted]—June 30, 2014
A horse walks into a triangular bar of dimensions X,Y, and Z, where X and Z are perpendicular. He asks the barman where the toilets are.
“Y, the long face.”
 
Reddit—Jokes
chadochocinqo—November 17, 2016
A horse walks into a bar…
A horse walks into a bar and asks the bartender “On a right-angled triangle with the sides X, Y and Z, if X and Z are perpendicular, which side is opposite to the right angle?
The bartender responds “Y, the long face?”
 
Facebook
Bad Dad Jokes
Kevin White ·
November 30, 2018 at 8:13 PM ·
A horse walks into a bar and asks the bartender to help him with a geometry problem. The horse explains, “There’s a right triangle sides x, y, and z. Sides x and z are perpendicular. Which side is the hypotenuse?” The bartender replies, “Y, the long face.”
 
Reddit—Jokes
Airick39—January 21, 2020
A horse walks into a bar and says,
Walks into a bar
“A right triangle with sides x, y, and z where x and z are perpendicular, which side is opposite the right angle?”
The bartender says,
“Y, the long face.”
 
Facebook
Brandon Crawford
June 27, 2020 at 11:34 AM ·
A horse walks into a bar and says, “On a right-angled triangle with side X, Y, and Z, if X and Z are perpendicular, which side is opposite the right angle?”
The bartender says, “Y, the long face.”
 
Facebook
Helped me through Lockdown #staysafe ·
Stephen Gould ·
February 14, 2021 at 1:38 AM ·
Pythagoras walks into a bar and says “Which one is the Hypotenuse?”
The Barman says “y, the long face”.
 
Facebook
Brian Hanlon
February 14, 2021 at 7:04 AM ·
Pythagoras walks into a bar and says “Which one is the Hypotenuse?”
The Barman says “y, the long face”.
     
X/Twitter
Will Mac
@MrMac_Math
Pythagoras walks into a bar
muttering, ‘If a right-angled triangle
has a short side, X, a long side, Y, and
hypotenuse, Z, then the square of Z
must be equal to the sum of the
square of X and the square of, erm… uh…’
The barman says, ‘Y, the long face?’
12:55 PM · Oct 22, 2021
   
Facebook
Tom Bolt
January 14, 2022 at 10:54 AM ·
A horse walks into a bar and says, “On a right triangle with sides X, Y, and Z, if X and Z are perpendicular which side is opposite the right angle?
The bartender says, “Y, the long face.”
 
X/Twitter
Moshe Vardi
@vardi
A horse walks into a bar and says: “On a right angle triangle with sides X, Y and Z, if X and Z are perpendicular, which side is opposite the right angle?”
The barman says: “Y, the long face.”  😊
4:41 PM · Feb 12, 2022
 
Facebook
Alan James Long
August 14, 2022 at 6:17 AM ·
Pythagoras walks into a bar and says “Which one is the Hypotenuse?”
The Barman says “y, the long face”.