"What do you call a cow during an…

A cow riddle is:

Q: What do you call a cow during an earthquake?
A: A milk shake.

Forms of the riddle have been cited in print since at least 1967 and 1983.

“What do you call a cow in a tornado?”/“A milk shake” and “What do you call a cow on a trampoline?”/“A milk shake” are similar riddles.

26 October 1967, The Daily Times (Salisbury, MD), “Jumble” puzzle by Henri Arnold and Bob Lee, comics sec. (Pg. 41?), col. 5:
Answer: What happened when an earthquake struck the dairy—IT MADE PLENTY OF MILK SHAKE

Google Books
Remember the A la Mode:
Riddles and Puns
By Charles Keller
Illustrated by Lee Lorenz
Englewood Cliffs, NJ: Prentice-Hall
1983
Pg. ?:
What do you get when you cross a cow with an earthquake? A milkshake

13 November 1984, Philadelphia (PA) Daily News, pg. 48, col. 5:
Q. What happens to cows who get caught in an earthquake?
A. They give milkshakes.
.. Melieka Lambert, Room 30
Hanna School, Philadelphia

19 September 1987, The Advocate (Newark, OH), “A Little Bit of Humor,” The Bubble Gum Rapper, pg. 12, col. 3:
Manny: Did you hear about the cow who got caught in an earthquake?
Danny: No, what about her?
Manny: SHe gave terrific milkshakes!

20 June 1997, Cincinnati (OH) Enquirer, “The Riddler: an 11-year-old sixth-grader” by Cliff Radel, pg. B1, col. 1:
Dixie Cups receive, 4,193 entries. Eleven-year-old Laura (Kreuter—ed.), who lives in Miami Township, entered this winner:

Q: What happens to a cow when it’s in an earthquake?
A: A milk shake.

14 March 1999, Los Angeles (CA) Times, “The Kids’ Reading Room; Pint-Sized Punch Lines,” pg. E6, col. 1:
What do you call a cow stuck in an earthquake? A milk shake! (Pedro Aquino, 10, Los Angeles, Main Street Elementary)

Google Books
January 2000, Boys’ Life, “Think & Grin,” pg. 65, col. 2:
Bill: What do you get when a cow is stuck in an earthquake?
Phil: What?
Bill: A milk shake. — Clayton Morrow, Loysville, Pa.

1 January 2000, San Diego (CA) Union-Tribune, “Start new year with a good savings plan” by Ed Blitz, pg. E2:
What do you get when a cow gets caught in an earthquake?
A milkshake.

24 March 2002, Sunday Telegraph (Surry Hills, New South Wales), “THe Funday Telegraph” by Matthew Frilingos, pg. F1:
What do you get when a cow is in an earthquake?
A milkshake

Twitter
Jen Wachtel‏
@jwachtel
Megan:“What do you call a cow in an earthquake?” Me: “I don’t know, what?” Megan: “A milkshake!”
10:32 AM - 27 Apr 2008

Twitter
swiv‏
@swiv
@AsukaBlossoms What do you call a cow in an earthquake? A milk shake.
12:25 AM - 28 May 2009

Twitter
Laura‏
@OddGirlMe
@FunnyBloke what do u call a cow during an earthquake?? A milk shake! :o)
8:04 AM - 29 May 2009

Google Books
Jokes For Kids:
300 Funny Jokes for Kids
By Jim Hogan
Pronoun
2017
Pg. ?:
Q. What do you call a cow in an earthquake?
A. A milkshake!

“What do you call a cow during an earthquake?”/“A milk shake.”