“Get me an alligator sandwich, and make it snappy”

“Get me a crocodile/alligator sandwich, and make it snappy” is a popular one-line joke with a pun on the word “snappy” (quick). “A crocodile sandwich, and make it snappy” has been cited in print since at least 1978.
 
   
Wikipedia: One-line joke
“Get me a crocodile sandwich, and make it snappy” (Anonymous)
     
Google Books
London Charivari
Volume 274  
1978
Pg. 537:
If I hear “a crocodile sandwich, and make it snappy” said once more as though for the first time I shall immolate the offending party.
     
Google Books
South
Greatvine Limited
Issues 27-38
1983
Pg. ?:
You know — the one about the man who goes into a cafe and says to the waiter: “Get me an alligator sandwich and make it snappy.”
 
28 August 1984, Miami (FL) Herald, “Sun’s Weller keeps things in perspective,” pg. 5C:
This is a man who has entered restaurants, studied the menu, and earnestly ordered, “A crocodile sandwich please, and make it snappy.”
     
Google Books
Kisaeng: a novel
By Marc Olden
New York, NY: D.I. Fine
1991
Pg. 321:
“He said, ‘Give me an alligator sandwich and make it snappy.’”
       
BBC News
Last Updated: Thursday, 10 June, 2004, 10:05 GMT 11:05 UK
Rogue Hong Kong crocodile bagged
(...)
COMMENTS
A huge crocodile sandwich and make it snappy!
Chris James, Phuket, Thailand
     
Google Books
The Oxford Companion to American Food and Drink
Edited by Andrew F. Smith
New York, NY: Oxford University Press
2007
Pg. 306:
Humor, Food
’‘Waiter, waiter! Bring me a crocodile sandwich, and make it snappy!’‘
 
Harrow Observer (UK)
Farr on food: Exotic tastes
Mar 25 2010 With Terry J Farr Of Friends Restaurant In Pinner, Harrow Observer
(...)
This story made it into one of the evening newspapers, with the comment ‘at last you can go into a bar and ask for an alligator sandwich, and make it snappy’.