“A guy walks into a bar…” is a typical form of what has been called the “bar joke.” A photon version is:
 
“An infra-red photon walks into a bar and says, ‘Is it hot in here or is it just me?’”
   
Brian Malow, self-proclaimed as “Earth’s Premier Science Comedian,” created the joke and popularized it in a November 2009 performance video.  There are other “photon walks into a bar” jokes, but this is the most popular.
 
   
Google Groups: alt.zen
Re: art for art’s sake [ waz Re: Messenger of God (was Re: Fixable?)
Dave K
8/19/07
(...)
A photon walks into a bar and the bartender says, “what’ll you have?”
The photon says, “Eh…I’m not particulate.”
 
Walks Into A Bar Jokes
TUESDAY, MARCH 17, 2009
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An infra red photon walks into a bar and says “is it hot in here or is it just me?”.
 
YouTube
‘A Virus Walks Into a Bar…’ and Other Science Jokes - Brian Malow
ForaTv
Uploaded on Nov 20, 2009
Complete video at: http://fora.tv/2009/11/08/Science_Lau…
Science comedian Brian Malow jokes that a virus is “the ultimate David and Goliath” when compared with humans. He then rattles off a series of science-related jokes. “Schrodinger’s cat walks into a bar, and doesn’t.”
2:10
“An infra-red photon walks into a bar and says, ‘Is it hot in here or is it just me?’”
 
Twitter
Carlos Only
‏@carloscadillac
An infrared photon walks into a bar and says: hey, is it hot in here or is just me?
10:27 AM - 23 Nov 2009
 
Twitter
Josh Carroll
‏@theleica
An infra-red photon walks into a bar and says “Is it hot in here, or is it just me?” #badsciencejokes
7:52 AM - 25 Nov 2009
 
Whatever Works
Science jokes
Posted 11th January 2011 by Emilija Emma
I watched a show of a science comedian, Brian Malow, today. Yes, there is such a profession - exciting! I think he was pretty good; not excellent, but decently funny. At the end of the show he came up with multiple ‘bar’ jokes, aiming for a smaller fraction of the audience with each new joke. I am sure that at least two of the people who read this blog will enjoy the jokes 😊
 
. An infra-red photon walks into a bar and says “Is it hot in here or is it just me?”
 
Google Groups: alt.dreams.castaneda
more science jokes
thang ornerythinchus
9/22/11
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An infrared photon walks into a bar and says, “Is it hot in here, or is it just me?”
   
John the Math Guy
Wednesday, May 22, 2013
My favorite “photon walked into a bar” jokes
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An infrared photon walked into a bar and said, “is it hot in here, or is it just me?”