“When you’ve seen one lion clawing a tourist at the zoo, you’ve seen a maul” was posted on the newsgroup alt.humor.puns on February 11, 1995. “Seen a maul” is a pun on “seen them all.”
   
“If you’ve seen one vicious bear attack, you’ve seen a maul” was posted on Twitter by Absolute Dude on November 26, 2011. “Once you’ve seen one bear attack, you’ve seen a maul” was posted on Twitter by the ‘dwayne ‘‘the rock’’ johnson’ on January 22, 2013. “If you’ve seen one bear attack…you’ve seen a maul” was posted on Reddit—Dadjokes on August 9, 2021.
   
Similar jokes include “Once you’ve seen one rugby joke, you’ve seen a maul” and “When you’ve seen one shopping center, you’ve seen a mall.”
       
 
Google Groups: alt.humor.puns
“SEEN THEM ALL”
Steve Schardin
Feb 11, 1995, 2:56:00 PM
Remember,
When you’ve seen one Galleria, you’ve seen a mall.
Remember,
When you’ve seen one camel driver, you’ve seen ahmal.
Remember,
When you’ve seen one gangsters girlfiend, you’ve seen a moll.
Remember,
When you’ve see one large rodent making tunnels underground, you’ve seen a mole.
When you’ve seen one lion clawing a tourist at the zoo, you’ve seen a maul.
When you’ve seen one large wooden hammer, you’ve seen a maul.
 
Google Groups:
amusing puns
::darkshadows::
Apr 4, 2009, 1:11:44 AM
(...)
See one melée of unruly people and you’ve seen a maul.
   
Twitter
Absolute Dude
@celibate_celeb
If you’ve seen one vicious bear attack, you’ve seen a maul.
12:00 PM · Nov 26, 2011·Twitter for iPhone
   
Twitter
the ‘dwayne ‘‘the rock’’ johnson’
@mugkip
Once you’ve seen one bear attack, you’ve seen a maul.
1:52 AM · Jan 22, 2013·Tweetbot for iOS
   
Twitter
Gene Spafford
@TheRealSpaf
“@jazmasta: If you’ve seen one bear attack video you’ve seen a maul.”
2:09 PM · May 22, 2015·Buffer
 
Reddit—Jokes 
Posted by u/AsylumScott December 9, 2015
Once you’ve seen an Elephant attacked by a lion…
You’ve seen a maul.
   
Reddit—Jokes
Posted by u/LewisF44 May 26, 2019
Once you’ve seen one Lion eat a Giraffe…
You’ve seen a maul!
   
Reddit—Jokes
Posted by u/justamobile September 10, 2020
Once you’ve seen a lion eat a camper
you’ve seen ‘em maul.
 
Twitter
FRO VO
@fro_vo
if you’ve seen one bear attack you’ve seen a maul
11:09 AM · Aug 8, 2021·Twitter for iPhone
 
Reddit—Dadjokes
Posted by u/bearontheroof August 9, 2021
If you’ve seen one bear attack…
...you’ve seen a maul.