“What do you call two banana skins?”/“A pair of slippers.”

The banana peel gag—laughing at someone slipping on a banana peel—was popular in the late 1800s and early 1900s. One joke is:
 
Q: What do you call two banana skins?
A: A pair of slippers.
 
“A pair of slippers—The orange and banana skins” was a joke from the New York City humor magazine Puck in 1882 that was reprinted in many newspapers. “It takes two banana skins to make a pair of slippers” was a popular joke in 1903 newspapers.
 
   
14 October 1882, Boston (MA) Journal, “Current Notes,” pg. 2, col. 4:
A pair of slippers—The orange and banana skins.—Puck.
 
23 June 1903, The Evening News (San Jose, CA), pg. 5, col. 6:
It takes two banana skins to make a pair of slippers.—Chicago News.
 
Google Books
The Amazingly Simple Banana Diet
By Clifford Thurlow
London: Alma House
1995
Pg. 20:
What do you call two banana skins?
A pair of slippers.
 
Google Groups: alt.humor.puns
Puns of the Weak 02-28-03
Stan Kegel
2/28/03
(...)
What would you call two banana skins ?
A pair of slippers (Kid’s Jokes).
   
Google Books
101 Short and Hilarious Jokes for Kids:
Jokes They’ll Tell Again and Again
By Scott Allen
Delabarre Publishing at Smashwords
2010
Pg. ?:
What do you call two banana skins?
A pair of slippers.
 
Google Books
Food Jokes For Kids 10
By Peter Crumpton
PeteyRF Creative
2015
Pg. ?:
What do you call two banana skins?
A pair of slippers.
 
Twitter
Ariyana 😊
‏@ariiiiiii01
What do you get when you cross one banana peel with another banana peel?
A pair of slippers
7:38 AM - 3 Aug 2016