An ethnic stereotype is that Jewish people are stingy with money. A joke is:
 
Q: What’s the difference between a Jew and a canoe?
A: A canoe tips.
 
The joke has been cited in print since at least 1978.
 
 
12 January 1978, Pittsburgh (PA) Post-Gazette, “Bench Strikes Out Telling Ethnic Jokes,” pg. 10, col. 2:
CINCINNATI (AP)—Baseball star Johnny Bench has Cincinnati high society in an uproar over his humor.
(...) (Col. 4—ed.)
“Do you know the difference between a Jew and a canoe? A canoe tips.”
       
Google Books
“88”:
An undercover news reporter’s expose of American Nazis and the Ku Klux Klan
By Andy Oakley
Skokie, IL: P.O. Pub.
1987
Pg. 58:
After our food arrives, Hank tells jokes between sips of coffee: “What’s the difference between a Jew and a canoe? A canoe tips.”
     
Google Books
Why We Curse:
A Neuro-Psycho-Social Theory of Speech
By Timothy Jay
Philadelphia, PA: John Benjamins North America
1999
Pg. 184:
Q. What is the difference between a canoe and a Jew?
A. A canoe tips.
 
Google Books
Beyond a Joke:
The Limits of Humour
Edited by Sharon Lockyer and Michael Pickering
New York, NY: Palgrave Macmillan
2005
Pg. 55:
So, there is a long tradition of attributing to minorities the characteristics of ‘stinginess’ and ‘tightness’ with money. Scottish people and Jewish people are typical recipients of such attributions:
 
Q: What’s the difference between a Jew and a Canoe?
A: A Canoe tips.
 
Twitter
Charlie Shrem‏
@CharlieShrem
@ReallyShecky Whats the difference between a Jew and a canoe? Answer: A canoe tips! (I’m Jewish I’m allowed to make fun of myself)
10:17 PM - 17 May 2009
 
Reddit—Jokes
What’s the difference between a Jew and a canoe?
submitted February 7, 2013 by bobobhai
What’s the difference between a Jew and a canoe?
A Canoe tips.
 
Twitter
Jesse Jondal‏
@JesseJondal
wanna know the difference between a jew and a canoe
sometimes the canoe tips
8:35 AM - 13 Sep 2017
 
Twitter
Anti Joke Apple‏
@AntiJokerApple
What’s the difference between a Jew and a canoe?
One is a person of Jewish descent and the other is a device for traversing waterways.
12:10 PM - 8 Oct 2017
 
Reddit—Jokes
What’s the difference between a Jew and a canoe?
submitted October 30, 2017 by Meloshav
If you push a canoe hard enough, it’ll tip.