“When does the leprechaun cross the road?”/“When it’s green!”

A leprechaun riddle is:
 
Q: When does the leprechaun cross the road?
A: When it’s green.
 
“Why did the leprechaun cross the road? Because the light was green” was printed in the Los Angeles (CA) Times on June 21, 2001. ” When does the leprechaun cross the road? When it’s green!” was posted on Twitter on April 17, 2012.
 
“Why did the leprechaun cross the road?”/“He wanted to reach the pot of gold faster” is a similar riddle with a different punchline.
 
 
21 June 2001, Los Angeles (CA) Times, “The Kid’s Reading Room; Jokes & Riddles,” pg. E9, col. 1:
Why did the leprechaun cross the road? Because the light was green. (Josue, 9, Brentwood Science Magnet, Los Angeles)
   
1 November 2006, Los Angeles (CA) Times, “The Kids’ Reading Room: Jokes & Riddles,” pg. E15, col. 4:
Why did the leprechaun cross the road? Because the light was green.
Jonathan, 12
Rea Elementary, Costa Mesa
 
Twitter
Carli Fish‏
@Carli__F
@totmac “Why did the leprechaun cross the road? Because the light was green!” Too late?
1:46 PM - 22 Apr 2010
 
Twitter
mire‏
@mireyiitta
THIS. THISTHISTHISTHIS!!!: When does the leprechaun cross the road?
When it’s green!
4:29 PM - 17 Apr 2012
   
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When does the leprechaun cross the road?
When it’s green!
 
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Q. When does the leprechaun cross the road?
A. When it’s green!