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.

Recent entries:
“I am rarely more focused on 5 seconds than when I’m waiting to skip an ad on the internet” (6/22)
Entry forthcoming—B.P. (6/22)
Entry forthcoming—B.P. (6/22)
Entry forthcoming—B.P. (6/22)
“Sometimes all you need is a billion dollars” (6/22)
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Entry from November 15, 2016
“What cake is as hard as a rock?"/"Marble cake.”

A marble cake riddle is:

Q: What cake is as hard as a rock?
A: Marble cake.


The riddle has been cited in print since at least 1976. “What cake would a sculptor use? Marble” was printed in a 1903 newspaper.


27 May 1903, Wilmington (DE) Journal, “A Cake Contest,” pg. 2, col. 5:
What cake would a sculptor use?
Marble.

13 December 1935, Reading (PA) Times, “Cake Guessing Begets Laughs,” pg. 30, col. 1:
What is the variety cake?
Marble.

Google Books
Biggest Riddle Book in the World
By Joseph Rosenbloom
Illustrated by Joyce Behr
New York, NY: Sterling Publishing Company, Inc.
1976
Pg. 96:
What cake is as hard as a rock?
Marble cake.

24 February 1976, Aiken (SC) Standard, “Blondie” comic strip, pg. 10, col. 5:
Dagwood Bumstead: THIS SPONGE CAKE IS HARD AS A ROCK!
Cook: IF YOU THINK THAT’S HARD YOU SHOULD TRY OUR MARBLE CAKE!

17 June 2007, The Pantagraph (Bloomington, IL), “Riddle Me This,” Flying Horse, comics sec., pg. ?, col. 6:
Q: What cake is hard as a rock?
A: Marble cake.

Twitter
Susan Endriss
‏@SuzzzyGal
#GOODHUMORMONDAY:  MARK:  What cake is as hard as rock?  RYAN: It’s unknown to me.  MARK:  Marble cake.
6:25 AM - 7 Feb 2011

Houston (TX) Chronicle
Jokes for children
December 24, 2014
(...)
What cake is hard as a rock?
Marble cake.

Posted by Barry Popik
New York CityFood/Drink • Tuesday, November 15, 2016 • Permalink