“Why don’t apples smile when you go bobbing?”/“Because they’re crab apples.”

An apple riddle is:
 
Q: Why don’t apples smile when you go bobbing?
A: Because they’re crab apples.
 
The joke is popular around Halloween, when apple bobbing traditionally occurs. The joke has been cited in print since at least 2001.
 
         
Google Books
Best Halloween Jokes
By Melvin Berger
New York, NY: Scholastic Inc.
2001
Pg. 28:
Why don’t apples smile when you go bobbing?
Because they are crab apples!
 
Google Groups: Palace of Adult Humor
Halloween Jokes
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10/23/06
(...)
Why don’t apples smile when you go bobbing ?
Because they’re crab apples !
     
Google Books
Insults Anywhere Kids Presents
Joke Book Of The Living Dead
By Franklin Yantz
Insults Anywhere
2011
Pg. ?:
Why don’t apples smile when you go bobbing ? Because they’re crab apples !
 
Twitter
william44
@shamrock4444
Why don’t apples smile when you go bobbing?
Because they’re crab apples! [Like it? http://ur.ly/SA7O ]
10:34 AM - 22 Jul 2011
     
Google Books
Sensible Nonsense.. Frank’s Comic Pack:
Humour Pack Series
By Frank Paul
BookBaby
2014
Pg. ?:
Why don’t apples smile when you go bobbing ?Because they’re crab apples !
 
Twitter
Lucky Score
@LuckyScoreNet
Why don’t apples smile
when you go bobbing
?
Because they’re crab apples !
#Joke from #AppleJokes in #Jokes, #Humor and #Satire
12:47 AM - 10 May 2018