“What’s the difference between men and pigs?”/“Pigs don’t turn into men when they drink.”

A drinking riddle is:
 
Q: What is the difference between men and pigs?
A: Pigs don’t turn into men when they drink.
   
The joke was posted on the newsgroup rec.humor on November 15, 1994.
 
 
Google Groups: rec.humor
Canonical List Of Men vs Women Humor 2/3
Natural Korn Shellers
11/15/94
(...)
What is the difference between men and pigs?
Pigs don’t turn into men when they drink.
 
Google Groups: za.humour
**SOME FACTS ABOUT MEN**
aquarama marina
5/7/96
(...)
8. Q.  What’s the difference between men and pigs?
A.  Pigs don’t turn into men when they drink.
 
Google Groups: aus.jokes
Wanted:your best male and female bashing jokes and stories.
Maggie Confessore
6/5/96
(...)
Q: What is the difference between men and pigs?
A: Pigs Don’t turn into men when they are drunk.
     
24 March 1999, The Mirror (London, UK), Sue Carroll’s column, pg. 9:
Q: What’s the difference between men and pigs?
A: Pigs don’t turn into men when they get drunk.
   
Google Books
Women vs Men & Men vs Women
By Ian Black and Lesley Riddoch
Edinburgh, Scotland: Black & White Publishing Ltd
2004
Pg. ?:
What’s the difference between men and pigs?
Pigs don’t turn into men when they drink.
 
Twitter
Heidy‏
@SelketXimenna
What is the difference between men and pigs? Pigs don’t turn into men when they drink.
6:45 PM - 2 Oct 2008
 
Twitter
Shinil Payamal‏
@shinils
What is the difference between men and pigs? ─ Pigs don’t turn into men when they drink.
2:50 PM - 1 Jan 2009
 
Google Books
Sensible Nonsense.. Frank’s Comic Pack:
Humour Pack Series
By Frank Paul
BookBaby
2014
Pg. ?:
What is the difference between men and pigs?Pigs don’t turn into men when they drink.