“Is a paternity test a pop quiz?” is a jocular question that was asked on the newsgroup Google Groups: alt.callahans on July 29, 1992. “Pop quiz — paternity test” was published in New York magazine on January 20, 1997.
 
“What idiot called it a paternity test and not a pop quiz?” was posted on Twitter on August 15, 2013, and on Reddit—Oneliners on March 19, 2018.
 
     
Wikipedia: DNA paternity testing
DNA paternity testing is the use of DNA profiling (known as genetic fingerprinting) to determine whether two individuals are biologically parent and child. A paternity test establishes genetic proof whether a man is the biological father of an individual, and a maternity test establishes whether a woman is the biological mother of an individual. Tests can also determine the likelihood of someone being a biological grandparent to a grandchild. Though genetic testing is the most reliable standard, older methods also exist, including ABO blood group typing, analysis of various other proteins and enzymes, or using human leukocyte antigen antigens. The current techniques for paternity testing are using polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP). Paternity testing can now also be performed while the woman is still pregnant from a blood draw.
         
Google Groups: alt.callahans
Gypsy makes a toast
Abner J. Mintz
7/29/92
(...)
Oh, BTW, here’s another question:
Is a paternity test a pop quiz?
   
Google Books
20 January 1997, New York magazine, “New York Magazine Competition,” pg. 111:
pop quiz — paternity test.
Jim Doherty, Tiverton, R.I.
 
Twitter
goose
@unbub_
What idiot called it a paternity test and not a pop quiz
1:37 PM - 15 Aug 2013
 
Twitter
FeloniousPunk
@SublimeBastard
Is a pop quiz another name for a paternity test?
8:33 PM - 26 Sep 2013
 
Twitter
RICHARD!
@agiantbird
Product idea: Pop Quiz! the home paternity test.
9:57 PM - 21 Oct 2013
 
Twitter
Tyler Snodgrass
@TylerSnod
What idiot called it a paternity test instead of a pop quiz?
11:53 PM - 31 May 2014
 
Twitter
Terry F
@daemonic3
What idiot called it a paternity test and not a pop quiz?
12:32 AM - 10 Sep 2014
 
Reddit—Oneliners
What idiot called it a paternity test and not a pop quiz?
submitted March 19, 2018 by madazzahatter