“What’s the key to a great Thanksgiving dinner?”/“The turkey.”

A popular riddle about Thanksgiving dinner is:
 
Q: What’s the key to a great Thanksgiving dinner?
A: The turkey.
 
The riddle was posted to the newsgroup alt.humor.puns on November 25, 1999.
 
“What key has legs and can’t open doors?”/“A turkey” is another key/turkey riddle.
 
 
Google Groups: alt.humor.puns
Gobbling up some puns
Bob C.
11/25/99
(...)
What is the key to a good Thanksgiving dinner?
The tur-key!
 
Google Groups: rec.autos.makers.vw.aircooled
OT- Thanksgiving humor
kev-ceri
11/20/01
(...)
What’s the key to a great Thanksgiving dinner?
The turKEY
 
GOogle Groups: alt.humor.puns
Puns of the Weak 11/29/02
Stan Kegel
11/29/02
(...)
What’s the key to a great Thanksgiving?
A tur-key, of course! (Kids Jokes)
   
22 November 2006, Los Angeles (CA) Times, “The Kids’ Reading Room; Jokes & Riddles,” pg. E24, col. 3:
What’s the key to a successful Thanksgiving dinner? A turkey.
Emily, 6
Gisler Elementary
Fountain Valley
 
Twitter
pachangadiaries
‏@pachangadiaries
knows what’s the key to a great Thanksgiving dinner? The tur-KEY.
3:59 PM - 27 Nov 2008
 
Teitter
Tooth Fairy
‏@toothfairycyber
Canadians: Thanksgiving Long Weekend:  What is the KEY to the perfect Thanksgiving Dinner?
A: TurKEY !!! ☺
2:19 PM - 11 Oct 2009
 
Google Books
Thanksgiving Turkey Jokes For Kids
By Peter Crumpton
PeteyRF Creative
2015
Pg. ?:
What’s the key to a great Thanksgiving dinner?
The turkey!