“Why do leprechauns giggle when they play soccer?”/“Because the grass tickles their balls.”

A leprechaun riddle was posted on Twitter on March 17, 2009:
 
Q: Why do leprechauns laugh when they run?
A: Cuz the grass tickles their nuts.
 
A soccer version of the leprechaun riddle was posted on Twitter on March 13, 2013:
 
Q: Why do leprechauns giggle when they play soccer?
A: Cause the grass tickles their balls.
 
The joke has been printed on several images.
     
       
Twitter
Dmarcus Ottey‏
@dalano
Why do leprechauns laugh when they run? Cuz the grass tickles their nuts. Happy St. Patrick’s Day!
12:26 PM - 17 Mar 2009
   
Twitter
bbrain‏
@bbra1n
Why do leprechauns laugh when they run across the meadow? ..
...
Because the grass tickles their balls.
12:59 PM - 17 Mar 2009
 
Twitter
Tony Weisbrot‏
@T3QUILA
Why do leprechauns giggle when they run? Cause the grass tickles their nuts!
2:14 PM - 17 Mar 2009
   
Twitter
Laura Harlow Davis‏
@LauraHarlow
why do leprechauns giggle when they run? because the grass tickels their balls
4:19 PM - 17 Mar 2009
     
Google Groups: chi.general
Pilchards
Huey
4/24/09
(...)
why do leprechauns giggle when they run?
 
because the grass tickles their balls.
       
Twitter
Burgh Fan‏
@BurghFanNJ
Corny Joke of the Day: Why do leprechauns giggle when they play soccer?—Cause the grass tickles their balls
5:01 AM - 13 Mar 2013
 
Twitter
shelly c‏
@shellyc1983
Why do leprechauns giggle when they play football??
Coz the grass tickles there balls!
4:59 AM - 17 Mar 2013
 
Facebook
Caspar Lee
March 17, 2014 ·
Why do leprechauns giggle when they play soccer? Cause the grass tickles their balls. Happy St.Patricks Day!
     
Reddit—Jokes
Why do Leprechauns laugh when they run?
submitted April 10, 2014 by jortan
Because the grass tickles their balls.
   
Reddit—Jokes
Why do Leprechauns always laugh as they run across a field?
submitted March 17, 2015 by Crazycupofjoe
The grass tickles their balls
 
Google Books
HOA**holes
By Mark Leysen
Lulu Press (Lulu.com)
2016
Pg. 154:
“Why do leprechauns laugh while playing soccer? The grass tickles their balls!”
 
Twitter
Dad Jokes‏
@GoodOldDadJokes
Why do leprechauns giggle when they play soccer? Cause the grass tickles their balls #JobsForLeprechauns
9:31 PM - 15 Mar 2017