“People who say ‘good morning’ should be forced to prove it”

“Good morning!” is a common greeting. “What’s good about it?” is a frequent—and usually unwelcome—response.
 
“People who say ‘Good morning’ should be forced to prove it” is a jocular saying that has been printed on ecards and GIFs. “Whoever saying ‘good Morning’ this week have to prove it!” was cited on Twitter on December 11, 2011. “People who say ‘good morning’ should be forced to prove it” was cited on Twitter on May 2, 2012.
 
“Anyone who says ‘good morning’ on a Monday is a sociopath” is another popular “good morning” saying.
 
   
Vassar Hub
Acceptance Remarks by Kathleen Holman Langan ‘46, Recipient of the Award for Outstanding Service to Vassar College
Volunteer Leadership Conference, October 8, 2004
By Kathleen Holman Langan ’46
(...)
It is a small story, but one you will recognize as part of the Vassar picture, the same picture that goes with the very old joke about the professor who says good morning to a class. At College A, which I won’t name, the students take out their copy books and write, “Good morning,” but at Vassar they say, “Prove it!”
 
Twitter
andy zulfiqqar
‏@andy_zulfiqqar
Whoever saying “good Morning” this week have to prove it!
6:24 PM - 11 Dec 2011
 
Twitter
Lone Wolf
‏@ViolentMisfit
next person that says good morning ima really need em to prove it
10:55 AM - 9 Feb 2012
 
Twitter
‏@QuaintQueerGuy
People who say ‘good morning’ should be forced to prove it. •__•
2:09 AM - 2 May 2012
 
Facebook
The Awesome Quotes
November 1, 2012 ·
People who say “Good Morning” should be forced to prove it…...! XD
 
Google Books
Summer Raine
By Cerrie Hedger
Lulu.com
2013
Pg. 28:
And personally I think anyone who says “Good morning!” should be forced to prove it and shot if they can’t.
 
Twitter
Ain
‏@Ain0407
Saw this signage outside a bar: “If someone wishes you a good morning, he should be forced to prove it.”
My sentiments exactly.
10:17 PM - 17 Aug 2015