A popular cow joke is:

Q: Where do cows go for entertainment?
A: To the moo-vies.

The joke has been cited in print since at least 1979.

“Where do cows go on vacation?"/"Moo York” is a similar cow joke.


14 October 1979, Kokomo (IN) Tribune, “Riddles ‘n Giggles,” comics sec., pg. ?, col. 5:
WHERE DO COWS GO FOR ENTERTAINMENT?
TO THE MOO-VIES

30 July 1983, Newsday (Long Island, NY), “Smiles,” pt. 2, pg. 12, col. 4:
Where do cows go on dates?
To the MOO-vies.
-- Nicole Pensabene, Holbrook

8 December 1983, Lexington (KY) Herald-Leader, “Jokes,” pg. D-10, col. 1:
Where do cows go on Saturday night?
To the moooovies!

Google Books
A Treasury of Science Jokes
By Morris Herbert Goran
Springfield, IL: Lincoln-Herndon Press
1986
Pg. 10:
Where do cows go on dates? To the moovies.

Google News Archive
21 October 1986, The Ledger (Lakeland, FL), “Al’s Favorite Jokes,” pg. 8W, col. 2:
Where do cows go for fun?
To the moo-vies.
Jamila Span, 11,
Jewett Elementary School

Google Books
500 More Hilarious Jokes for Kids
By Jeff Rovin
New York, NY: Penguin Books
1990
Pg. 10:
Q: Where do cows go on a date?
A: To the moooovies.

Twitter
HiLOVENEWYORK
‏@SLUTLUST
@mattiesafer guess who? Where do cows go on a date? To the moooooooovies!!!! (Hahahahhahahaa)
5:33 AM - 6 Dec 2008

Twitter
Sonya Kaye
‏@PuppyCarson85
where do cows go on dates? to the MOOvies.  i am far too easily amused.
Vive le twinkie
8:35 PM - 20 Feb 2009

Google Books
The VERY Embarrassing Book of Dad Jokes:
Because your dad thinks he’s hilarious
By Ian Allen
London: Portico Books
2012
Pg. ?:
Where do cows go on their day off?
To the moovies.