“JavaScript” is not a screenplay about coffee, but there are many puns. “Javascript (which I thought was a screenplay about coffee)” was posted on the newsgroup Google Groups: rec.arts.mystery on April 25, 2002.
   
“If you wrote a screenplay about coffee, would it be a JavaScript?” was posted on Twitter on December 31, 2014.
   
     
Wikipedia: JavaScript
JavaScript (/ˈdʒɑːvəˌskrɪpt/), often abbreviated as “JS”, is a high-level, dynamic, untyped, and interpreted run-time language. It has been standardized in the ECMAScript language specification. Alongside HTML and CSS, JavaScript is one of the three core technologies of World Wide Web content production; the majority of websites employ it, and all modern Web browsers support it without the need for plug-ins. JavaScript is prototype-based with first-class functions, making it a multi-paradigm language, supporting object-oriented, imperative, and functional programming styles. It has an API for working with text, arrays, dates and regular expressions, but does not include any I/O, such as networking, storage, or graphics facilities, relying for these upon the host environment in which it is embedded.
         
Google Groups: rec.arts.mystery
MARK BILLINGHAM - WEBSITE
Mark Billingham
4/25/02
(...)
I’ve forwarded that bit of technical feedback about javascript (which I thought was a screenplay about coffee)...onto the site designer.
 
Google Books
Google:
The Missing Manual
By Sarah Milstein, J.D. Biersdorfer, Rael Dornfest and Matthew MacDonald
Sebastopol, CA: O’Reilly Media, Inc.
2006
Pg. 212:
If, on the other hand, you think JavaScript is a screenplay about coffee, stick with the prefab bookmarklets.
 
Twitter   
Jason Smith‏
@jaosmith
I’m trying to write a screenplay about coffee enthusiasts. I’m calling it my Java Script.
11:56 AM - 31 Mar 2011
 
Twitter
Amy Butler‏
@AmyRButler
@grantjbutler RT @theingenuity I spilled coffee on my screenplay… I guess it’s a Java Script now
8:27 PM - 26 Apr 2012
 
Twitter     
Finch‏
@finchlynch
Replying to @ReturnoftheYak
@ReturnoftheYak you should write a screenplay about coffee. then you’d have a javascript.
1:29 PM - 8 Mar 2013
 
Twitter
Ben Swanson‏
@CardboardGerald
Java script? What’s that, a screenplay about coffee? I love coffee! Ha ha ha just a bit of computer humor for all the cool folks out there
12:04 PM - 11 Jun 2014
 
Twitter
Andrew Sweeso‏
@AtFirstNo5
If you wrote a screenplay about coffee, would it be a JavaScript?
8:06 PM - 31 Dec 2014
 
Twitter
Jon Griffin‏
@griffin_jon
If I were to write a screenplay about coffee, would it be known as a Java script? #amwriting #oneliners
8:22 PM - 20 Oct 2016
 
Twitter
Steven W Skinner‏
@SkinnerSteven
I’m writing a screenplay about coffee and I’m almost done the JavaScript
8:59 AM - 30 Apr 2017