A joke about the debating club is:
 
“In university, I was going to join the debating team, but someone talked me out of it.”
 
Canadian comedian Stewart Francis has told the one-line joke in his act since at least 2006.
 
   
Wikipedia: Stewart Francis
Stewart Francis is a Canadian comedian, actor and writer. In addition to his work in Canada and the US, he frequently tours in the UK and appears on British television. Both of Francis’ parents are British.
       
Google Books
The Hollywood Reporter
Volume 393
2006  
.. and Stewart Francis, who also showcased comedic curveballs and one-liners (“I was going to join a debate club, but someone talked me out of it” and “Did I already do my deja vu joke?”).
   
YouTube
Stewart Francis - One Liners
Robert Beardwell
Uploaded on Oct 12, 2008
Here is Stewart Francis with his brilliant one liners, this is him appearing on British television (ITV) on the show for one night only.
5:39:
“In university, I was going to join the debating team, but someone talked me out of it.”
 
Twitter 
Lia Cadman
‏@LiaCadman
I was going to join the debate team but someone talked me out of it #mocktheweek
3:18 PM - 6 Aug 2009
 
Twitter
Mason Allerby
‏@Me_Mason
Was going to join a debating team till someone talked me out of it… God i love Mock the week!
3:18 PM - 6 Aug 2009
 
Twitter
ǝɔɹɐǝd ןǝɐɥɔıɯ
‏@mklprc
“I was going to join the debating team in high school, but someone talked me out of it.”—Stewart Francis, on Mock the Week.
10:54 PM - 12 Aug 2009
 
Spiritual Forums
Jokes - one-liners/question and answers!
amy green
10-09-2012, 12:55 PM
More Stewart Francis 1 Liners (since you like him most on this thread!)
(...)
I was going to join the debating team, but somebody talked me out of it…..
 
Google Books
The Little Book of Laughter:
Using humour as a tool to engage and motivate all learners
By Dave Keeling
Carmarthen, Wales: Independent Thinking Press
2014
Pg. ?:
In school I wanted to join the debating team ... but someone talked me out of it.
Stewart Francis
 
reddit
I was going to join the debating team in high school, but someone talked me out of it.
submitted April 7, 2015 by ForTheLoveofGob
 
Facebook
Mystique
June 3, 2015 ·
I was going to join the debate team, but someone talked me out of it.
 
Twitter 
Rapid
‏@RapidWolf_
in school i failed maths so many times, I can’t even count.
Althought I was going to join the debating team but someone talked me out of it
4:16 PM - 8 Dec 2015
 
reddit
I was gonna join the debating team
submitted July 18, 2016 by Imreally_negative
But somebody talked me out of it