“Why are there no jokes about turkey giblets?”/“Because the punchlines are offal.”

A turkey giblets riddle is:
 
Q: Why are there no jokes about turkey giblets?
A: Because the punchlines are offal.
 
The riddle has been cited in print since at least December 2013, when it was included in a list of Christmas crackers.
   
   
Wikipedia: Offal
Offal /ˈɒfəl/, also called variety meats, pluck or organ meats, refers to the internal organs and entrails of a butchered animal. The word does not refer to a particular list of edible organs, which varies by culture and region, but includes most internal organs excluding muscle and bone. As an English mass noun, the term “offal” has no plural form. Some cultures shy away from offal as food, while others use it as everyday food, or in delicacies.
   
Mirror (UK)
New Christmas cracker jokes after modern makeover - what’s your favourite?
Groans at corny Christmas cracker jokes are as much of a festive tradition as the turkey - almost three-quarters of us believe the gags are outdated
BYRUKI SAYID
00:00, 10 DEC 2013 UPDATED 11:12, 10 DEC 2013
(...)
Why are there no jokes about turkey giblets? Because the punchlines are offal.
 
Twitter
BBC Radio Wales
‏@BBCRadioWales
.@jasonmbbc wants your Christmas cracker jokes. Why are there no jokes about turkey giblets? Because the punchlines are offal!
4:36 AM - 10 Dec 2013
 
Twitter
Althams Butchers
‏@Althamsbutchers
Q:Why are there no jokes about turkey giblets?
A:Because the punchlines are offal
#Turkey #Jokes #Offal
5:27 AM - 11 Dec 2013
 
Twitter
Chris Moose
‏@thechrismoose
Why are there no jokes about turkey giblets? Because the punchlines are offal!
3:48 AM - 12 Dec 2013
 
Twitter
Johnny Parker
‏@JohnnyPGood
Why are there no jokes about turkey giblets?
Because the punchlines are offal.
#christmasCrackerJokes
11:12 AM - 25 Dec 2014
 
Twitter
Elaine Cavey
‏@ElaineCavey
@jonanor #adventjokes day2 🎄🎅 ⛄️
Why are there no jokes about turkey giblets? Because the punchlines are offal !
12:41 AM - 2 Dec 2016