“A guy walks into a bar...” is a typical form of what has been called the “bar joke.” A penguin version is:

“Two penguins walk into a bar, and the bartender says ‘Waddle it be, boys?’”

“Waddle it be, gentlemen?” was a photo caption in the Chicago (IL) Tribune on December 15, 1993. “185 Penguins walked into a bar. The Bartender said, “‘WADDLE it be?’” was posted on Twitter on November 14, 2014.


15 December 1993, Chicago (IL) Tribune, pg. D3, col. 2 photo caption: 
‘Waddle it be, gentlemen?’
Although more accustomed to greeting humans, a doorman at Montreal’s Inter-Continental Hotel does the honors Thursday for a pair of Magellanic penguins. The two guests flew in from Florida’s Sea World to tour Montreal area schools to promote conservation

Twitter
John Linde‏
@Shankopotamoose
If I was a bartender for penguins I would ask “Waddle it be?” jk, thats specieist, no one likes a specieist…
5:31 PM - 20 Feb 2012

Twitter
ComedyCity‏
@ComedyCityKC
ComedyCity Official Groaner Joke of the Day:
185 Penguins walked into a bar.
The Bartender said, “ WADDLE it be?”
9:42 AM - 14 Nov 2014

Reddit—Oneliners
Two penguins walk into a bar, and the bartender says “Waddle it be, boys?”
submitted November 28, 2017 by 2livecrewnecktshirt