“The turtle took two chocolates to Texas to teach Thomas to tie his boots”

A Texas tongue-twister riddle is:
   
Q: The turtle took two chocolates to Texas to teach Thomas to tie his boots. How many T’s in that?
A: There are 2 T’s in THAT!
 
The riddle appears to have been cited in print since at least 2006.
 
     
Ducksters
(Google dates this as July 26, 2006, although this may be in error.—ed.)
Q: The turtle took two chocolates to Texas to teach Thomas to tie his boots. How many T’s in that?
A: There are 2 T’s in THAT!
   
Yahoo! Answers
April 17, 2008
The turtle took two chocolates to Texas to teach Thomas to tie his boots. How many T’s in that?
Best Answer:  two
   
The Free Choice E-Zine
SUNDAY, AUGUST 29, 2010
THE SUNDAY FUNNIES: AUGUST 29, 2010
(...)
Q: The turtle took two chocolates to Texas to teach Thomas to tie his boots. How many T’s in that?
A: There are 2 T’s in THAT!
 
Twitter
Ginno Mendoza
‏@batangmakulet12
9.
The turtle took two chocolates to Texas to teach Thomas to tie his boots. How many T’s in that?
—kuletz
11:27 AM - 6 Nov 2010
 
Twitter
Joan Yazze Gallegos
‏@JoanMarie87
Q: The turtle took two chocolates to Texas to teach Thomas to tie his boots. How many T’s in that? A: There are 2 T’s in THAT!
9:10 AM - 21 Jul 2011
 
Facebook
Tickles & Giggles
June 28, 2012 ·
The turtle took two chocolates to Texas to teach Thomas to tie his boots. How many T ’ s are there in That?
 
Explain the Joke
Teeeerrific
Posted on January 30, 2013 by stfleming
Q: The turtle took two chocolates to Texas to teach Thomas to tie his boots.  THow many Ts in that?
A: There are 2 Ts in “That“!
 
Explanation:  The question confuses the listener by having a sentence with so many of the letter “T”.  While you are distracted trying to count Ts, the real question comes- How many Ts in “That”?  Well, in the word “that” there are only 2 Ts: one at the beginning and one at the end. Got ya!
     
23 July 2013, The Chronicle (Toowoomba, Queensland), “Joke of the Week,” pg. 23:
Q: The turtle took two chocolates to Texas to teach Thomas to tie his boots. How many T’s in that?
A: There are 2 T’s in THAT!
 
Google Books
LOL Tongue Twisters Collection:
Over 250 Tongue Twisters for Kids and Adults Who Don’t Take Themselves too Seriously!!
By Marcus Stuart
LOL Books
2016
Pg. ?:
The turtle took two chocolates to Texas to teach Thomas to tie his boots. How many T’s in that?
 
There are 2 T’s in THAT!