“What do you get when an elephant walks through your garden?”/“Squash.”

A “squash” pun is:
 
Q: What do you get when an elephant walks through your garden?
A: Squash.
 
The elephant joke has been cited in print since at least 2003.
 
 
Google Books
Noah’s Favorite Animal Jokes
Compiled by Barbour Staff
Urichsville, OH: Barbour Publishing, Inc.
2003
Pg. ?:
What vegetable do you get when an elephant walks through your garden?
Squash.
 
Google Books
Without a Trace
By Carolyn Keene
New York, NY: Aladdin Paperbacks
2004
Pg. 28:
Although it does bring to mind that old joke: What do you get when an elephant walks through your garden?”
 
“What?” I asked.
 
“Squash!”
 
Google Books
Lunchbox Laughs:
A Book of Food Jokes
By Mark Ziegler
Minneapolis, MN: Picture Window Books
2005
Pg. 14:
What vegetable do you get when an elephant walks through your garden?
Squash
   
Twitter
Hooters
‏@Hooters
Joke of the Week: What vegetable do you get when an elephant walks through your garden?
Squash!
1:20 PM - 10 Jul 2009
 
Twitter
Reading Coach
‏@estubblereading
Abby’s joke-What do you get when an elephant stomps in your vegetable garden? Squash
1:40 PM - 5 Jan 2010
 
Google Books
Chuckle Squad:
Jokes about Classrooms, Sports, Food, Teachers, and Other School Subjects
By Michael Dahl
Mankato, MN: Picture Window Books
2011
Pg. 51:
What vegetable do you get when an elephant walks through your garden?
Squash.
   
18 December 2012, The Signal (Rycroft, lta), “Letters to Santa Claus from area schools,” pg. B2:
Dear Santa Claus,
I am going to tell you a few jokes! Okay here we go. What do you get when an elephant walks through your garden? Squash!