“What do you call a girl who stands in the middle of a tennis court?”/“Annette.”

A popular tennis pun is:
 
Q: What do you call a girl who stands in the middle of the tennis court?
A: Annette (a net).
 
The pun has been cited in print since at least 2000, when it started as an elephant joke:
 
Tyler: What do you call an elephant who lies across the middle of a tennis court?
Ryan: It’s unknown to me.
Tyler: Annette!
 
     
Google Books
Super-Duper Good Clean Jokes for Kids
By Bob Phillips
Eugene, OR: Harvest House Publishers
2000
Pp. 116-117:
Tyler: What do you call an elephant who lies across the middle of a tennis court?
Ryan: It’s unknown to me.
Tyler: Annette!
   
Google Books
Dude, Got Another Joke?
By Bob Phillips
Eugene, OR: Harvest House Publishers
2002
Pg. 112:
Lambert: What do you call a girl who lies in the middle of a tennis court?
Laszlo: Beats me.
Lambert: Annette.
 
Google Books
Blonde Walks into a Bar:
The 4,000 Most Hilarious, Gut-Busting Gags, One-Liners and Jokes
By Jonathan Swan
Berkeley, CA: Ulysses Press
2008
Pg. ?:
What do you call an elephant that lies across the middle of a tennis court?
Annette!
 
Twitter
John
‏@nematome
@mgkimsal Ha! Don’t get me started. What do you call a woman who stands in the middle of a tennis court?  Annette.
2:42 PM - 21 Mar 2008
 
Twitter
Andy Wilson
‏@WilloLFC
What do you call a girl standing in the middle of a tennis court ? Annette ! Annette .. get it .. a net .. sometimes i wonder why i bother !
8:45 AM - 22 Apr 2009
 
The Amazingly Lame Joke of the Day
Tuesday, May 24, 2011
What do you call a girl in the middle of a tennis court?
Annette.
Posted by Tim Wycislak at 2:29 AM
 
reddit
What do you call a girl who stands in the middle of a tennis court?
submitted May 27, 2015 by Buster_Nutt
Annette.
 
Twitter
Teddy Tennis London
‏@TeddyTennisLDN
Funny Friday - what do you call a girl who stands in the middle of the tennis court?
- Annette!!!!! #funnyfriday
6:45 AM - 22 Apr 2016