“A guy walks into a bar...” is a typical form of what has been called the “bar joke.” A giraffe version was cited in 1993:

“A giraffe walks into a bar and says, ‘High balls on me!’”

A different punchline was used in 2006:

“A giraffe walks into a bar and the bartender asks, anyway. Do you want a longneck? The giraffe replies, Do I have a choice?”

“A giraffe walks into a bar and the barman says, ‘I’m sorry, we don’t serve Heineken here’” and “A giraffe walks into a bar. Giraffes aren’t good at playing limbo” are other giraffe versions.


Google Groups: rec.humor
a shorter, funnier joke!!
sl...@cc.usu.edu
12/14/93
(...)
A giraffe walks into a bar and says, “High balls on me!”

Google Groups: alt.tasteless.jokes
Favorite Joke - Not Tasteless
I LOVE CONNIE !!!!!!!
2/12/95
(...)
> Giraffe walks into a bar and says, “The hiballs are on me!...

Google Groups: rec.humor
The Bar
Michael Coan
9/13/95
Giraffe walks into a bar and announces:
“The highballs are on me!”

Google Groups: rec.humor
wanted:man-horse-duck walks into a bar jokes
Lynn M Wiegard
5/19/95
(...)
A giraffe walks into a bar.  The bartender says, go outside, the drinks are on the house.

Two giraffes walk into a bar.  The bartender asks, “What’ll you have?” and they reply, “Give us two tall ones.”

Google Books
Guy Walks Into A Bar...:
501 Bar Jokes, Stories, Anecdotes, Quips, Quotes, Riddles and Wisecracks
By Michael Lewis
New York, NY: Black Dog & Leventhal Publishers, Inc.
2006
Pg. 92:
A giraffe walks into a bar and the bartender asks, anyway. Do you want a longneck? The giraffe replies, Do I have a choice?

Twitter
Brian Herman
‏@brianherman
Your daily groan: A giraffe walks into a bar & orders a beer. Bartender says “Do you want a long neck?” Giraffe says, “Do I have a choice?”
9:54 AM - 15 Oct 2008

Google Books
The Best ‘A Man Walks Into A Bar’ Jokes
By Billy Brownless
Crows Nest NSW: Allen & Unwin
2009
Pg. 86:
A giraffe walks into a bar. The bartender says, ‘Do you want a long neck?’ The giraffe says, ‘Do I have a choice?’

Google Groups: alt.radio.talk.dr-laura
A GIRAFFE WALKS INTO A BAR
mightyjoe
5/6/12
Bartender:  “Why the long neck?”
Giraffe:  “Just put the drink on the ceiling, a-hole.”

YouTube
Jokes - A giraffe walks into a bar, looks around, and says, “Well guys, I guess the highballs are on
jokesus
Published on Oct 5, 2015
Joke :
A giraffe walks into a bar, looks around, and says, “Well guys, I guess the highballs are on me!”

Thrillist
38 NEW “ANIMAL WALKS INTO A BAR” JOKES, BECAUSE PUNS ARE AWESOME
By DAVID BLEND @daveblend
PUBLISHED ON 10/26/2015
(...)
A giraffe walks into a bar. Bartender says, “How about a long neck?”