"What's the scariest…

The Italian dessert “tiramisu” sometimes becomes “terrormisu” (terror + tiramisu) for Halloween. “Terror-Misu” was printed in the Los Angeles (CA) Times on May 30, 1996.

“Terrormisu” is also the name of a Super Mario video game character.

“Q. What is Osama Bin Laden’s favourite dessert? A. Terrormisu” was posted on Twitter on July 2, 2009. “Terrormisu. The scariest dessert in the world” was posted on Twitter on June 1, 2013.

Wikipedia: Tiramisu
Tiramisu (from the Italian language, spelled tiramisù [tiramiˈsu], meaning “pick me up”, “cheer me up” or “lift me up”) is a popular coffee-flavoured Italian custard dessert. It is made of ladyfingers dipped in coffee, layered with a whipped mixture of eggs, sugar, and mascarpone cheese, flavoured with cocoa. The recipe has been adapted into many varieties of cakes and other desserts. Its origins are often disputed among Italian regions such as Veneto, Friuli-Venezia Giulia, Piedmont, and others.

Super Mario Wiki
Terrormisu (also known by her false name Tiaramisu) is an ancient demon who surpasses Count Cannoli as the main antagonist of Wario: Master of Disguise and is also the game’s final boss. Her name is derived from “tiramisu”, an Italian dessert.

30 May 1996, Los Angeles (CA) Times, “Drop-Dead Yummy” by Barbara Hansen, pg. H2, col. 1:
And think of the possibilities for Halloween. Who’d want candied apples when they can have Hack and Chop Layer Cake, Terror-Misu, or Fatally FUdge Brownies?

Google Groups: alt.creative.writing
What does a ghost eat?
omjaram
10/21/04
(...)
Desserts
I Scream
Boobury Pie
Boo Meringue
Ghoul Whip
Terrormisu
Ladyfingers
Ghoulda Cheese
Monster Cheese

Twitter
Darragh Doyle‏
@darraghdoyle
Q. What is Osama Bin Laden’s favourite dessert? A. Terrormisu. #popbitch
5:44 AM - 2 Jul 2009

Twitter
Santosh‏
@Zantoch
good name for a halloween themed dessert: terrormisu
3:34 AM - 28 Oct 2009

Twitter
lesliecarothers‏
@tkpleslie
I know you are a great cook, @LaVeuve…did you have TerrorMisu for dessert tonight? Happy Halloween!!
7:39 PM - 31 Oct 2010

Google Books
The Mammoth Book of One-Liners
Edited by Geoff Tibballs
London, UK: Constable & Robinson Ltd
2012
Pg. ?:
What was Bin Laden’s favourite dessert?
Terrormisu.

Twitter
HEADLINE payoff‏
@headlinepayoff
Terrormisu. The scariest dessert in the world.
2:38 PM - 1 Jun 2013

Twitter
Cameron Boyes‏
@cameronboyes
Terrormisu: the world’s most frightening dessert
10:48 PM - 30 Nov 2013

Twitter
Fresh Stand Up‏
@FreshStandUp
What’s a Muslim’s favourite desert?Terrormisu. http://bit.ly/YoRw8C via @sickipedia
3:29 AM - 27 Sep 2014

Twitter
JasonLastname‏
@JasonLastname
[browsing restaurant menu]
Would you say your scariest dessert is the iscream or the terrormisu?
12:35 PM - 12 Jan 2015

Twitter
Quillzebub‏
@QuillGator
What’s the scariest dessert in the world? Terrormisu.
4:27 PM - 20 Mar 2015

Twitter
Swag Dracula‏
@Swag_Dracula
What is Dracula’s favorite dessert?
Terrormisu.
#watchthestreams
4:22 PM - 15 Sep 2017

“What’s the scariest dessert?”/“Terrormisu.”