“Why did the bowl of soup disappear?”/“It was leek soup.”

“Leek soup” has been the subject of several “leak soup” puns. “Q: What did you do all night? A: Leak soup” was posted on the newsgroup uk.singles on December 3, 1997.
 
A riddle was posted on Reddit—3amjokes on November 3, 2017:
 
Q: Why did the bowl of soup disappear?
A: It was leek soup.
   
           
Wikipedia: Leek  
The leek is a vegetable, a cultivar of Allium ampeloprasum, the broadleaf wild leek. The edible part of the plant is a bundle of leaf sheaths that is sometimes erroneously called a stem or stalk. The genus Allium also contains the onion, garlic, shallot, scallion, chive, and Chinese onion.
 
Google Groups: uk.singles
An invitation to Marc Donovan
Stuart O. Bronstein
12/3/97
(...)
Q: What did you have for breakfast?
A: Leek soup.
 
Q: What did you have for lunch?
A: Leek soup.
 
Q: What did you have for supper?
A: Leek soup.
 
Q: What did you do all night?
A: Leak soup.
 
Twitter
Chrisensible 🗯️‏
@onion2k
Replying to @Ranimationnotes
@Anifersgirl Why did the man hold a saucepan under the hole in his roof? He was making leak soup! #badoomtish
3:34 AM - 26 Mar 2009
 
Twitter
Allie Rivera‏
@alliebeingallie
me: “we made potato leak soup” mike: “did you keep it in the bowl?” me: “...yes?” mike: “well you said it was leaking…” OMG I LOVE PUNS
7:30 AM - 5 Mar 2010
     
Twitter
Developer Steve‏
@DeveloperSteve
The only problem with Potato and Leak soup is when you put it in the cup the cup gets all leaky! #HXLHACK #Punny
3:41 AM - 11 Jul 2015
 
Twitter
kieran‏
@kieran_keek
“Her leak soup leaked in her car! It was leak soup!” 😂😂
12:46 PM - 22 May 2017
 
Twitter
River‏
@DipStyx_
Why did the plumber frown at the dinner table?
It was a leek soup, again!
#sorrynotsorry #mokkamondays
6:19 AM - 24 Apr 2017
 
Reddit—3amjokes
Why did the bowl of soup disappear? self.3amjokes
Submitted November 3, 2017 by zubbs99
It was leek soup.
 
Twitter
LOL Tweets™‏
@lolmgco
Why did the bowl of soup disappear?
It was leek soup.
7:28 PM - 3 Nov 2017