“What do you call cows with a sense of humor?”/“A laughing stock” is a joke from at least 1975 that was posted on Reddit on December 2, 2015. A slightly different joke was posted on Reddit the same day:
 
Q: What do you call cows that don’t have a sense of humor?
A: Feminists.
 
Both jokes were posted together on Twitter on December 10, 2015.
 
     
Reddit
What do you call cows that have a sense of humor?
submitted December 2, 2015 by Hank_The_Cat
Laughing stock.
 
Reddit
What do you call cows that don’t have a sense of humor?
submitted December 2, 2015 by superkeke
Feminists.
 
Twitter
Jokester Jokes
‏@fromJokester
What do you call cows that have a sense of humor?
Laughing stock 😏
What do you call cows that don’t have a sense of humor?
Feminists 😁
6:22 PM - 10 Dec 2015
 
Twitter
Joke Authority
‏@JokeAuthority
What do you call cows that don’t have a sense of humor? Feminists.
5:28 PM - 20 Dec 2015
 
Reddit
What do you call cows with no sense of humor?
submitted October 6, 2016 by 1jackg
Feminists
 
Twitter
frederick
‏@FeelinTheFuture
What do you call a cow without a sense of humor?
A feminist 😂🐄
9:39 PM - 6 Oct 2016