“I can give you the cause of anaphylactic shock in a nutshell”

“I can give you the cause of anaphylactic shock in a nutshell” is a joke from British stand-up comedian Gary Delaney, who used it in the BBC show Mock the Week. The joke was posted to Twitter on June 27, 2013.
 
Delaney placed fifth with the joke in August 2013 at the Edinburgh Festival Friinge.
     
 
Wikipedia: Anaphylaxis
Anaphylaxis is a serious allergic reaction that is rapid in onset and may cause death. It typically causes more than one of the following: an itchy rash, throat or tongue swelling, shortness of breath, vomiting, lightheadedness, and low blood pressure. These symptoms typically come on over minutes to hours.
 
Common causes include insect bites and stings, foods, and medications. 
 
Wikipedia: Gary Delaney
Gary Justin Delaney (born 16 April 1973, in Solihull) is an English writer and stand-up comedian.

Twitter
Flowerbedgrl
‏@flowerbedgrl
“I can give you the leading cause of anaphylactic shock in a nutshell” Droll #mocktheweek
4:19 PM - 27 Jun 2013
 
Twitter
Smurph
‏@S_Murphy_
“I can give you the lead cause of anaphylactic shock in a nutshell.” LOOL brillaint. #MockTheWeek
4:20 PM - 27 Jun 2013
 
Twitter
Beth Brewster
‏@BethEleri
“I can give you the cause of anaphylactic shock in a nutshell.” Play on word jokes the winners at Edinburgh this year http://www.comedy.co.uk/fringe/2013/features/dave_joke_of_the_fringe_2013/ …
6:44 PM - 19 Aug 2013
 
BBC News
Rob Auton’s chocolate joke is Fringe ‘funniest’
20 August 2013
From the section Edinburgh, Fife & East Scotland
(...)
The top 10 were:
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5. Gary Delaney - “I can give you the cause of anaphylactic shock in a nutshell.”
   
Google Books
More One Liners, Jokes and Gags
Compiled by Grant Tucker
London: Biteback Publishing
2013
Pg. ?:
I can give you the cause of anaphylactic shock in a nutshell.