“Why didn’t the piglets listen to the teacher pig?”/“Because he was an old boar.”

Are teachers boring? One pun is:
 
Q: Why didn’t the piglets listen to the teacher pig?
A: Because he was an old boar.
 
“Why wouldn’t the piglets listen to their father? Because he was such an old boar” was published in a joke book in 1987.
 
         
Google Books
Smart Alec’s Revolting Jokes for Kids
New York, NY: Ballantine Books
1989, ©1987
Pg. 26:
Why wouldn’t the piglets listen to their father? Because he was such an old boar.
   
Klosi Jokes
Category: Pig jokes
Date Added: 11/10/2007
Joke: Why didnt the piglets listen to the teacher pig?Because he was an old boar.
 
Twitter
Marley The Dog‏
@marleyterrier
Replying to @wilsonbear
@wilsonbear Why didn’t the piglets listen to the teacher pig? Because he was an old boar.
9:18 AM - 21 Jul 2009
 
Twitter
Marcus Wilson‏
@MarcusWilsom
Why didn’t the piglets listen to the teacher pig?Because he was an old boar.
12:22 AM - 23 Jul 2010
 
20 June 2012, Western Advocate (Bathurst, New South Wales), “Hi boys and girls, Slim Tex Warren the singing cowboy,” pg. 13:
Q: Why didn’t the piglets listen to their grandfather?
A: Because he was an old boar!
 
Google Books
Sensible Nonsense.. Frank’s Comic Pack:
Humour Pack Series
By Frank Paul
BookBaby
2014
Pg. ?:
Why didn’t the piglets listen to the teacher pig?Because he was an old boar.
 
YouTube
Ok, here is the joke. Why didn’t the piglets listen to the tea…
botcaster inc. bot
Published on Jan 23, 2016
Why didn’t the piglets listen to the teacher pig?
Because he was an old boar.
 
Twitter
Lucky Score‏
@LuckyScoreNet
Why didn’t the piglets listen to the teacher
pig?
Because he was an old boar.
#Joke from #PigJokes in #Jokes,  #Humor and #Satire
11:14 PM - 9 Jul 2017