“A time traveler walks into a bar…” (bar joke)

“A guy walks into a bar…” is a typical form of what has been called the “bar joke.” A time travel version is:
     
“Bartender says ‘We don’t serve time travelers here.’ A time traveler walks into a bar.”
     
The joke was cited on Twitter on December 7, 2009.
   
“To get to the time machine.”/“Why did the chicken cross the road?” is a similar time travel joke on a popular meme.
   
         
Twitter   
Birdspot
‏@birdspot
@aphriza @canagica did you see/hear this already? Bartender says “We don’t serve time travelers here.” A time traveler walks into a bar.
3:22 PM - 7 Dec 2009
 
Twitter
Aaron Muszalski
‏@sfslim
The bartender says “We don’t serve time travelers here.” A time traveler walks into a bar.
3:08 PM - 1 Dec 2010
 
Twitter
Danny O’Reilly
‏@dannyoreilly84
The barman says, “We don’t serve time travellers in here”. A time traveller walks into a bar.
2:53 PM - 27 Jan 2011
 
Twitter
Ted Hobgood
‏@tedhobgood
“The bartender says, ‘We don’t serve time travellers in here.’ 185 time travellers walk into a bar.”
(via @pokeHQ)
8:51 AM - 4 Feb 2011
 
Twitter
Mr. CLT
‏@CLTLocalvore
Lol groan RT @benvyle: The barman says: “We don’t serve time travelers in here.” Two time travelers walk into a bar.
10:18 AM - 15 May 2011
 
Twitter
paulkeogan
‏@paulkeogan
@amandapalmer
The Barman says we don’t serve time travelers here.
Two Time travelers walk into a bar.
8:01 PM - 3 Jun 2011
 
Twitter
bēn
‏@benvyle
@RichieNuzzolese The barman says: “We don’t serve time travellers in here.” Two time travellers walk into a bar.
12:49 PM - 19 Jul 2011
 
Google Books
The October List
By Jeffery Deaver
New York, NY: Grand Central Publishing
2013
Pg. ?:
The bartender says, “We don’t serve time travelers in here.”
A time traveler walks into a bar.
 
Google Books
A Prairie Home Companion
Pretty Good Joke Book (6th Edition)
Introduced by Garrison Keillor
Prince Frederick, MD: Highbridge
2015
Pg. ?:
The barman says, “We don’t serve time travelers in here.”
A time traveler walks into a bar.
 
reddit
Sorry we don’t serve time travelers here (self.Jokes)
submitted March 2, 2016 by badwolf99
Two time travelers walk into a bar