“How does North Korea celebrate Christmas?”/“With missile tows.”

“Missile tow” is a pun on “mistletoe.” “Santa knows the missile-tows the line in every way” is the line of the song “The 24 Sours Of Christmas” that dates to at least 1994.
 
There have been several jokes about North Korea’s missiles. “What is at the top of Kim Jong Il’s Christmas list this year? A Missile Tow #bjfriday” was posted on Twitter on December 9, 2011. “How does North Korea celebrate Christmas? With missile tows” was posted on Reddit—Jokes on December 23, 2017.
 
       
Wikipedia: Mistletoe
Mistletoe is the most common name for most obligate hemiparasitic plants in the order Santalales. They are attached to their host tree or shrub by a structure called the haustorium, through which they absorb water and nutrients from the host plant.
 
Google Groups: rec.music.dementia
The 24 Sours Of Christmas Parts 1-3
santa_claus
12/26/96
Happy Holidays:
This fun post was posted in 1994 and 1995 but as of 12/26, nobody decided to do it this time.
(...)
Buy war toys for Christmas;  have a happy holiday
Santa knows the missile-tows the line in every way
Teach those happy little children to by hell-cats when they play
And have a very merry military day
       
Twitter
Jon Krause™‏
@jonkrause
What is at the top of Kim Jong Il’s Christmas list this year? A Missile Tow #bjfriday
9:56 AM - 9 Dec 2011
 
Twitter     
Alex Fitzpatrick‏
@AlexJamesFitz
Replying to @RonanFarrow
@RonanFarrow Santa armed with missile TOWs
10:29 PM - 4 Dec 2013
 
Twitter
Rowland M. Eturma‏
@niteranger0127
In the spirit of Christmas, my greatest wish is for all terrorists worlwide to receive a lot of Missile-TOWs as a… http://fb.me/2zE549BFo
4:17 AM - 16 Dec 2013
 
Twitter
Monchichi Demo‏
@APeckOfPickles
Someone let @NASA and @USArmy know. I just passed a florist that is apparently selling “missile tows.” Price seemed very reasoanable.
4:26 PM - 22 Dec 2016
   
Twitter
Claudia Chong‏
@ClaudiaaaChong
What did the army wished for Christmas?
a “missile tow” 🎄🚀
9:20 AM - 11 Dec 2017
 
Reddit—Jokes
How does North Korea celebrate Christmas?
submitted December 23, 2017 by odoylesrules
With missile tows
 
Twitter
Jan Schill‏
@schill_jan
How does North Korea celebrate Christmas?
With missile tows
#jokes -from Reddit-
9:36 PM - 23 Dec 2017