“Why do hamburgers feel sad at barbecues?”/“They get to meet their old flames.”

A hamburger riddle is:
 
Q: Why do hamburgers feel sad at barbecues?
A: They get to meet their old flames!
   
The joke was printed in the book 101 Hamburger Jokes (1978) by Phil Hirsch.
   
               
Google Books
101 Hamburger Jokes:
Meaty Jokes to be Devoured with Relish
By Phil Hirsch
New York, NY: Scholastic, Incorporated
1978
Pg. ?:
Why do hamburgers feel sad at barbecues?
They get to meet their old flames!
 
My Morning Jacket
The Daily Hamburger Joke
EC
on: Aug 06, 2005, 07:21 AM
A great gift from the elders was bestowed upon me yesterday.  It was given to me to use as a source of profundity and deep comfort.  I have decided to share the teachings of this book with the world, here.  I am hoping that I remember to do this.
 
The book is called “101 Hamburger Jokes ...meaty jokes to be devoured with relish”, written by Phil Hirsch.
(...)
Re: The Daily Hamburger Joke
EC
Reply #8 on: Aug 11, 2005, 07:41 AM
Why do hamburgers feel sad at barbecues?
They get to meet their old flames!
 
funnyjoke.com.au
Category: Burger jokes
Date Added: 10/10/2007
Joke: Why do hamburgers feel sad at barbecues?They get to meet their old flames!
 
Twitter
vanessa_willims‏
@vanessa_willims
Why do hamburgers feel sad at barbecues? They get to meet their old flames!
9:36 AM - 10 Jan 2010
       
Google Books
The Mammoth Book of Really Silly Jokes:
Humour for the whole family
Edited by Geoff Tibballs
London, UK: Constable & Robinson Ltd
2011
Why do hamburgers feel sad at barbecues?
They get to meet their old flames!
 
Google Books
Sensible Nonsense.. Frank’s Comic Pack:
Humour Pack Series
By Frank Paul
BookBaby
2014
Pg. ?:
Why do hamburgers feel sad at barbecues?They get to meet their old flames!
 
Twitter
Apple Valley Stores‏
@AppleValleyCafe
Q: Why do hamburgers feel sad at barbecues? ...A: They get to meet their old flames! 😂🍔 #BunPun #HamburgerHumor
12:17 PM - 21 Sep 2017