“Do I like my coffee black? There are other colors?”

“Do I like my coffee black? There are other colors?” is a jocular line that has been printed on several images. THe joke has been cited in print since at least 1966, when this was published in many newspapers:
   
Waiter: Do you want your coffee black?
Customer: What other colors do you have?
 
       
15 February 1966, Courier-Post (Camden, NJ), “Fun Time—The Chuckle Box” by A. Leokum, pg. 33, col. 2:
Waiter: Do you want your coffee black?
Customer: What other colors do you have?
   
29 January 1969, Orlando (FL) Sentinel, “Ramblings” by Jim Lewis, Entertainment, pg. 7, col. 4:
Jim-A-Ling: The next time you’re asked if you want your coffee black, ask what other colors they have to offer!
 
Google Books
September 1971, Boys’ Life, “Think and Grin,” pg. 90 ,col. 2:
Waiter: Would you like your coffee black?
Customer: What other colors do you have?—Danny Smythe, Plattsburgh, N.Y.
 
18 February 1973, Great Falls (MT) Tribune, “Mini Jokes,” The Mini Page, pg. 3, col. 1:
Waiter: Sir would you like your coffee black?
Customers: What other colors do you have?
Patricia Yirsa, Big Sandy, Montana
 
Google Books
The All-New Clean Joke Book
By Bob Phillips
Eugene, OR: Harvest House Publishers
1990
Pg. 180:
Waiter: Would you like your coffee black?
Customer: What other colors do you have?
 
Google Groups: sci.military.moderated
Nukes in Space
terry vernon
10/18/00
(...)
Terry V.
—-
ţ MM 1.1 #0367 ţ Do I want my coffee black?  - There are other colors?
 
Twitter
Arizona Coffee‏
@arizonacoffee
Retweeting @ComicTwit: Waiter: Would you like your coffee black? Customer: What other colors do you have?
12:15 PM - 3 Dec 2008
 
Twitter
Lance Hill‏
@lancehill
Do I like my coffee black?  There are other colors?
7:57 AM - 6 Jan 2009
 
Twitter
Caffeine Zone‏
@caffeinezone
Do I like my coffee black? There are other colors? ~Author Unknown
8:53 AM - 22 Mar 2009
 
Google Books
Chicken Soup for the Coffee Lover’s Soul:
Celebrating the Perfect Blend
By Jack Canfield, Mark Victor Hansen and THeresa Peluso
Cos Cob, CT: Chicken Soup for the Soul Publishing, LLC
2013
Pg. ?:
Do I like my coffee black?
There are other colors?
Author Unknown