“What does a clock do when it’s hungry?”/“It goes back four seconds.”

“If a clock has already eaten but is still hungry, does it go back four seconds?”—a pun on “go back for seconds”—is a joke that appears to have been cited in print since at least 2000. It’s not known who first told the riddle.
 
   
Google Books
My Little Bit of Nonsense
By Charlie Walker
Wakefield: C. Walker
2000
Pg. 22:
When a clock is hungry it goes back four seconds.
 
17 April 2002, Plainview (TX) Daily Herald, “Dijon vu: The same mustard as before”:
When a clock is hungry, it goes back four seconds.
 
Google Books
The Land Where My American Mother Died-Palermo, Sicily:
A Novel
By Bennett Fairorth
Lincoln, NE: iUniverse, Inc.
2003
Pg. ?:
“When a clock is hungry, it goes back four seconds.”
 
11 March 2003, Estherville (IA) Daily News, pg. 5, col. 1:
Yesterday’s Cryptoquip: IF A CLOCK HAS ALREADY EATEN BUT IS STILL HUNGRY, DOES IT GO BACK FOUR SECONDS?
 
Google Books
The Laugh-a-Day Book of Bloopers, Quotes & Good Clean Jokes
By Jim Kraus
Grand Rapids, MI: Baker Books
2012
Pg. ?:
DAY 247
When a clock is hungry, it goes back four seconds.
 
Twitter
Princess
‏@MyNames_Nichole
What does a clock do when it’s hungry?
It goes back four seconds .
HHAHAHAHA 😂😂😂👏
9:48 PM - 3 Dec 13