A “housewarming party” usually doesn’t involve “warming the house,” but there are jokes. “Positive spin #13: ‘Arson, m’lord? Not at all. We just misunderstood what a housewarming party entailed’” was posted on Twitter by Craig on December 6, 2010. “Just had a huge argument with the neighbor over the housewarming party I threw him, or as he called it, ‘arson’” was posted on Twitter by Some Dude on July 20, 2011.
   
Forms of the joke were popularized on the Sickipedia website. “Threw a housewarming party for the pakis next door. Well. I called it a housewarming. The police called it arson” was posted on Twitter by sickipediabot on July 22, 2011. “I threw a housewarming party for my new muslm neighbours. Well, I called it housewarming, the police called it arson” was posted on Twitter by sickipediabot on May 24, 2013.
     
“A space heater makes a great housewarming gift” and “When I moved into my new igloo, my friends threw me a housewarming party and now I’m homeless” are other “housewarming party” jokes.
   
           
Wikipedia: Housewarming party
A house-warming party is a party traditionally held soon after moving into a new residence. It is an occasion for the hosts to present their new home to their friends, post-moving, and for friends to give gifts to furnish the new home. House-warming parties are generally informal. Usually there are no planned activities besides a possible tour.
   
Twitter   
Craig
@theblackwizards
Positive spin #13: “Arson, m’lord? Not at all. We just misunderstood what a housewarming party entailed.” #fb
3:13 PM - 6 Dec 2010
   
Twitter
Some Dude
@darwin_award_
Just had a huge argument with the neighbor over the housewarming party I threw him, or as he called it, “arson”.
1:16 PM - 20 Jul 2011
   
Twitter
sickipediabot
@sickipediabot
Threw a housewarming party for the pakis next door. Well. I called it a housewarming.
The police called it arson
7:29 PM - 22 Jul 2011
 
Twitter
sickipediabot
@sickipediabot
I threw a housewarming party for my new muslm neighbours. Well, I called it housewarming, the police called it arson
3:20 AM - 24 May 2013
     
Twitter
Rick Aaron
@RickAaron
I called it a “housewarming party”. The District Attorney called it “aggravated arson”. Semantics.
6:52 PM - 18 Oct 2015
 
Google Books
5,000 Great One Liners
Compiled by Grant Tucker
London, UK: Biteback Publishing Ltd
2016
Pg. ?
I just invited all the guys at my Arsonists Anonymous group to a housewarming party.
 
Twitter
John Cutler
@JCutlerOfficial
I threw a housewarming party for my neighbour last night…
Well I called it a housewarming.,. The police called it arson…
2:36 AM - 22 Aug 2018
 
Reddit—3amjokes
Threw my neighbors a really nice housewarming party. self.3amjokes
Submitted October 26, 2018 by porichoygupto
The cops are calling it arson, however.