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

“A duck walks into a bar. The bartender asks, ‘Waddle it be?’”

“I walked into a bar last night. Bartend said: ‘waddle it be?’” was posted on Twitter by Half Drunk Duck on July 7, 2011. “#AntiJokes A duck walks into a bar and the bartender says ‘Waddle it be?’ The duck doesn’t say anything because it’s a duck” was posted on Twitter by Derbel McDillet on November 23, 2011. “A duck walks into the bar. The bartender asks, ‘Waddle it be?’” was posted on Reddit—Dadjokes on March 14, 2019.

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


Twitter
Half Drunk Duck
@HalfDrunkDuck
I walked into a bar last night. Bartend said: “waddle it be?”
11:50 AM · Jul 7, 2011·Twitter for BlackBerry®

Twitter
Derbel McDillet
@aintevenmaddie
#AntiJokes A duck walks into a bar and the bartender says “Waddle it be?” The duck doesn’t say anything because it’s a duck.
1:08 PM · Nov 23, 2011·Twitter Web Client

Twitter
Jacob Strick
@jakestrick
A duck waddles into a bar and the bartender says, “Waddle it be?”
3:14 PM · Jul 29, 2012·Twitter Web Client

Twitter
Julian Cowan
@julian_cowan
A duck walks into a bar.
The barman says, “waddle it be?”
* ...waits for applause.
11:07 AM · Jul 17, 2013·Twitter for iPhone

Twitter
Johnny Is Awesome!
@SirWorksOutALot
So a duck walks into a bar and the bartender says “‘Waddle’ it be?” and the duck says nothing because it’s a duck.
5:20 PM · Sep 3, 2013·Twitter for iPhone

Twitter
dennis estopace
@DennisEstopace
A duck walks into a bar.
The bartender asks “Waddle it be?”
10:00 PM · Jul 16, 2017·TweetDeck

Twitter
Seth
@SethShaffer
A duck walks into a bar and the bartender says “Waddle it be?”
.........please don’t report my account
9:48 AM · Apr 5, 2018·Twitter for iPhone

Reddit—Dadjokes
Posted by u/porpois March 14, 2019
A duck walks into the bar.
The bartender asks, “Waddle it be?”

Twitter
Gian D’Oh
@GianDoh
A duck walks into a bar.
Bartender: Waddle it be?
5:13 PM · Jun 25, 2019·Twitter for iPhone

Twitter
THE BUNTZ# 23
@TheBURGERMEIST2
A duck walks into a bar.
The bartender says,
“Waddle it be”.??..
GIF
3:43 AM · Jun 8, 2021·Twitter Web App

Reddit—Dadjokes
Posted by u/VERBERD June 13, 2021
A duck walks into a bar....
The barman goes, “Waddle it be?”