“Remember, the ‘F’ in physics stands for fun”

“The F in Physics stands for Fun” was cited on Twitter on January 7, 2010. A tweet on September 20, 2011 was a little more detailed:
   
“the f in physics stands for fun”
”....there is no f”
“exactly” bahahaaha
   
JoyReactor illustrated the joke on March 30, 2010. A graphic (with Professor Hubert J. Farnsworth of the American animated television series Futurama)  was made with the expression.
     
   
Twitter
Rigby
‏@carcinophilia
The F in Physics stands for Fun.
9:53 AM - 7 Jan 2010
   
JoyReactor
anon
30.Mar.201016:00
In a Physics class having a tough time.
 
Teacher: “If you’re having trouble, just remember that the “F” in “PHYSICS” stands for FUN.”
Me: But sir, there is no “F” in “PHYSICS.”
Teacher: “EXACTLY.”
 
Twitter
mikela
‏@mikbradstreet
“the f in physics stands for fun”
”....there is no f”
“exactly” bahahaaha
1:22 PM - 20 Sep 2011
 
Twitter
#MrOiz || #Feb30
‏@TheOiz
Teacher: remember, the “f” in physics stands for fun..
Me: but sir, there is no “f” in physics. Teacher: Exactly
12:43 AM - 18 Nov 2011
 
Twitter
J.T
‏@JoshTheRealist
Teacher: remember, the “f” in physics stands for fun..
Me: but sir, there is no “f” in physics
Teacher: exactly.
2:06 PM - 18 Nov 2011