“What did the turkey say before it was roasted?”/“Boy! I’m stuffed!”

A Thanksgiving turkey riddle is:
 
Q: What did the turkey say before it was roasted?
A: “Boy! I’m stuffed!”
   
The joke has been cited in print since at least 1973. “Who doesn’t eat on Thanksgiving?”/“A turkey because it is always stuffed” and “Why didn’t the teddy bear eat dessert?”/“Because he was stuffed” are similar “stuffed” riddles.
       
     
15 July 1973, Pittsburgh (PA) Press, “Mini Jokes,” The Mini Page, pg. 3, col. 1:
Q. What did the turkey say before he went into the oven?
A. “Oh boy. I’m stuffed.”
Ron Haught (Tarentum)
       
Google Books
Let’s Celebrate Thanksgiving
By Connie Roop and Peter Roop
Illustrated by Gwen Connelly
Brookfield, CT: Millbrook Press
1999
Pg. 2:
Q: What did the turkey say just before it was popped into the oven?
A: I’m really stuffed.
 
GOogle Groups: news.admin.net.abuse.sightings
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11/1/00
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What did the turkey say before it was roasted?
Boy! I’m stuffed!
 
Google Groups: alt.humor.puns
Puns of the Weak 11/29/02
Stan Kegel
11/29/02
(...)
What did the turkey say before it was roasted?
Boy! I’m stuffed! (Jokes 4U)
 
22 November 2004, The Times (Shreveport, LA), “Serve turkey with a side of laughter” by Doreen Nagle (Gannett News Service), pg. 2D, col. 4:
QUESTION: What did the turkey say to the cook as he was being put in the oven?
ANSWER: “Boy, am I stuffed!”
   
Google Books
Joke & Riddle Ballyhoo
By Jacqueline Horsfall
Illustrated by Jackie Snider
New York, NY: Sterling Publishing Company, Inc.
2005
Pg. 50:
What did the turkey say to the dressing?
“I’m stuffed!”
   
November 2006, Professional Safety, “Turkey Day Clunkers,” pg. 64, col. 2:
What did the turkey say before it was roasted?
Boy, I’m stuffed.
 
Twitter
Greg Anderson
‏@gcgreg
RT @procyon8x: @gcgreg Thanks for follow. (What did the turkey say just before he was roasted? “Boy, am I stuffed!”) :D hahhahah
3:24 AM - 23 May 2009
   
Twitter
Hillsdale Co Chamber
‏@hcchamber
What did the turkey say before it was roasted? Boy! I’m stuffed!
County National Bank is hosting their 2nd… http://fb.me/62x4yWWJ1
9:12 AM - 26 Oct 2016