“Our restaurant’s snails are world-famous.”/“I know, one of them’s just been serving me.”

A restaurant joke about slow service is:
   
Restaurant Owner: Our restaurant’s snails are world-famous.
Diner: I know, one of them’s just been serving me.
   
The joke has been cited in print since at least 2016.
       
   
Twitter
@EUYIEN
Replying to @NWOOEU and @EUsnb
“Our restaurant’s snails are world-famous.”
“I know, one of them’s just been serving me.”
10:42 AM · May 28, 2016·Twitter for iPhone
 
Twitter
Tycer
@tycertank
“Our restaurant’s snails are world-famous.”
“I know, one of them’s just been serving me.”
2:18 AM · Jun 7, 2016·Twitter Web Client
   
Twitter
Joey Tamala
@Kamagong42
#MissUniverse #Philippines “Our restaurant’s snails are world-famous.”
“I know, one of them’s just been serving me.”
4:28 AM · Jan 27, 2017·Twitter Web Client
 
Twitter
Happy
@Happyfunnyjoke
Our restaurant’s snails are world-famous.”
“I know, one of them’s just been serving me.”at
12:30 AM · Jul 26, 2017·Twitter for Android
       
Johnson City (TN) News & Neighbor
Thoughts for the New Year…
BY N&N ADMIN ON JANUARY 3, 2018 EDITORIAL
Compiled by Bill Derby
(...)
. “Our restaurant’s snails are world-famous.”  “I know, one of them has just been serving me.”
 
Twitter
Uncle Gerry Four leaf clover
@IrishUncleGerry
Paddy said to Murphy “ good evening welcome to our wonderful establishment our restaurant’s snails are world-famous.” Murphy said I know, one of them’s just been serving me. #irishunclegerry #jokes
3:30 PM · Jan 28, 2019·Twitter for iPhone
 
Twitter
Lorraine Jo King
@lahlahbean
#badjokefriday
Waiter.. Our restaurant snails are world famous.
Customer.. I know one has just been serving me. Smiling face with open mouth and tightly-closed eyes
2:15 AM · Feb 21, 2020·Crowdfire App