“Why did the teacher have her hair in a bun?”/“Because she had her nose in a hamburger.”

A hamburger riddle is:
 
Q: Why did the teacher have her hair in a bun?
A: Because she had her nose in a hamburger.
       
The hamburger joke has been cited in print since at least 2000.
 
 
Google Books
1001 Really Stupid Jokes
By Mike Phillips
London, UK: Constable & Robinson Ltd
2000
Pg. ?:
Why did the teacher have her hair in a bun?
Because she had her nose in a hamburger.
 
Google Books
The Biggest Ever Joke Book
Bath, UK: Dempsey Parr
2000
Pg. ?:
Why did the teacher have her hair in a bun?
Because she had her nose in a hamburger.
 
20 July 2002, Evening Mail (Birmingham, UK), “Just for Laughs,” pg. 34:
Why did the teacher have her hair in a bun? Because she had her nose in a hamburger!
 
Twitter
Bollywood Sargam‏
@bollywoodsargam
Food jokes - 5063 Joke: Why did the teacher have her hair in a bun?
Because she had her nose in a hamburger… http://tinyurl.com/qn7nop
7:54 AM - 11 May 2009
 
Twitter
David Hunt‏
@David703
Why did the teacher have her hair in a bun?
Because she had her nose in a hamburger.
8:03 AM - 29 Aug 2009
   
Google Books
Sensible Nonsense.. Frank’s Comic Pack:
Humour Pack Series
By Frank Paul
BookBaby
2014
Pg. ?:
Why did the teacher have her hair in a bun? Because she had her nose in a hamburger.
 
Twitter
Yolanda Case‏
@caselbyolanda
Why did the teacher have her hair in a bun? Because she had her nose in a hamburger.
12:31 PM - 8 Mar 2017