A plaque remaining from the Big Apple Night Club at West 135th Street and Seventh Avenue in Harlem.

Above, a 1934 plaque from the Big Apple Night Club at West 135th Street and Seventh Avenue in Harlem. Discarded as trash in 2006.

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Entry from March 13, 2016
“A fire hydrant has H2O on the inside and K9P on the outside”

"A fire hydrant has H2O (water) on the inside and K9P (canine pee) on the outside” is a joke that has been printed in several joke books. “If you find H20 inside a fire hydrant, what do you find outside? K9P” was cited in print in 1989.


Google Books
Painfully Gross Jokes (Volume 8)
By Julius Alvin
New York, NY: Kensington Publishing Company
1989
Pg. 70:
If you find H20 inside a fire hydrant, what do you find outside?
K9P.

Google Groups: alt.tasteless.jokes
h2o
Shiloh Shorn
4/24/98
If you find h2o on the inside of a fire hydrant whadya find on the inside
k9p

January 2001, VFW (Veterans of Foreign Wars Magazine), “Jest a Minute,” pg. 50, col. 1:
I was asked what is the chemical symbol for water inside a fire hydrant. I said, “H20.” Then I was asked what is the chemical symbol for water outside a fire hydrant. I said, “K9P.”
Jim Tolnay, Corvallis, Ore.

Google Groups: alt.tasteless.jokes
If there is H2O on the inside of a fire hydrant, what is on the outside?
G - P
4/8/01
K9P

Google Books
A Prairie Home Companion
Pretty Good Joke Book

Introduced by Garrison Keillor
Minneapolis, MN: HighBridge
2003
Pg. 20:
If H20 is on the inside of a fire hydrant, what is on the outside?
K9P.

Twitter
Sam C
‏@Samography
ori asked for a tweet: If H2O is on the inside of a fire hydrant, what’s on the outside? K9P, of course!
5:04 PM - 31 Jul 2007

Google Books
Jokes for Blokes:
The Ultimate Book of Jokes Not Suitable for Mixed Company

By Llewellyn Dowd and Phil McCracken
New York, NY: Ebury Press
2011
Pg. 161:
If there is H20 on the inside of a fire hydrant, what’s on the outside?
K9P.

Google Books
Extremely Embarrassing Dad Jokes:
Because Dads Don’t Know When to Stop

By Ian Allen
New York, NY: Pavilion Books
2015
Pg. ?:
If a fire hydrant has H20 on the inside, what does it have on the outside?
K9P.

Posted by Barry Popik
New York CityStreets • Sunday, March 13, 2016 • Permalink