“A piece of gold 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 popular chemistry joke is:
 
“A piece of gold walks into a bar. The Barman says, ‘Au, get out of here!’”
 
“Au” (pronounced like “hey you!”) is the chemical symbol of gold. “A U get out of here!” was cited in print in February 2008. The joke was cited on Twitter on February 22, 2009 and has been printed on GIFs.
   
 
Boktai Online
SCIENCE!
Deleted User
Feb 4 2008, 10:14 PM
(...)
A piece of gold walks in to a bar, the bartender says, “A U get out of here!”
 
Twitter
Rowan Singh
‏@rowansingh
@serafinowicz A piece of gold walks into a bar. The Barman says, “Au, get out of here.”
9:37 AM - 22 Feb 2009
 
Twitter
Conn O’Neill
‏@conn_
A piece of gold walks into a bar.
The Barman says, ” ‘ey, you, get out of here.”
12:26 PM - 22 Feb 2009
 
Twitter
Jamie Turner
‏@jaymeetee
A piece of gold walks into a bar.
The Barman says, “Au, get out of here.”
2:10 PM - 22 Feb 2009
 
Twitter
Richard Bagshaw
‏@bagwaa
A bar of gold walks into a bar, the barman says “A U, get out!”
8:06 AM - 4 Mar 2009
     
The Escapist Forums
Science and maths jokes anyone?
XJ-0461
POSTED: 27 October 2009 3:58 pm
I’ve got quite a few, mainly due to science teachers:
Gold walks into a bar and the barman says “AU! Get out!”
   
Chemistry World Blog
Chemistry Jokes
Posted by Laura on Fri 15 Jul 2011
(...)
Gold walks into a bar, barman shouts Au get out of here!
   
Twitter
PUNS
‏@omgthatspunny
A bar of gold walks into a bar, and silver turns around and says, “AU, get outta here!”
5:52 PM - 6 Feb 2013
 
‎Facebook
Lawrence Fernandez
‎to I fucking love science
January 17, 2013 ·
A piece of gold walks into a bar.
The Barman says “Au, get out of here”
   
Science Notes
Chemistry Jokes and Puns
LAST MODIFIED: JUNE 29TH, 2015 BY ANNE HELMENSTINE
(...)
Stay golden.
Gold walks into a bar & started messing with somebody’s drink. The bartender saw & said “Au get outta here!”
— Tiffany17