A Christmas riddle is:
 
Q: What do you get when you combine/cross/mix a Christmas tree with an iPad?
A: A pineapple.
 
The Christmas tree is often a pine tree, and an iPad is made by Apple Inc.
 
“What do you get when you cross a Christmas tree with an iPad? A pineapple!” was posted on Twitter by Inactive Account on December 25, 2011.  “What do you get when you combine a Christmas tree with an iPad? A pineapple” was posted on Twitter by Ean on December 5, 2013. “this is all wrong, a pineapple is what you get when you mix a Christmas tree with an iPad” was posted on Twitter by 𝔗. ℭ𝔥𝔞𝔡 𝔚𝔦𝔫𝔡𝔢𝔯 on December 1, 2016.
   
“What do you get when you cross an apple with a Christmas tree?”/“A pineapple” is a related riddle.
 
     
Wikipedia: Christmas tree
A Christmas tree is a decorated tree, usually an evergreen conifer such as spruce, pine, or fir or an artificial tree of similar appearance, associated with the celebration of Christmas. The modern Christmas tree was developed in early modern Germany (where it is today called Weihnachtsbaum or Christbaum),
     
Twitter
Inactive Account
@AsdfghjklPkg
Replying to @Eddsworld
@eddsworld What do you get when you cross a Christmas tree with an iPad? A pineapple!
11:49 AM · Dec 25, 2011
   
Twitter
Jami Lee
@jamilee1913
What do you get when you cross a Christmas tree with an iPad?  A Pine-Apple!
7:10 PM · Nov 24, 2012
   
Twitter
SellMyTees
@SellMyTees
Number 4 of the 12 jokes of Christmas…
What do you get when you cross a Christmas tree with an ipad?
A:A PINEAPPLE!
(They can’t all be…
9:42 AM · Dec 14, 2012
   
Twitter
Ralph Kunkel
@ralphkunkel
15. What do you get when you cross a Christmas tree with an Ipad? A pineapple!
6:54 PM · Dec 15, 2012
   
Twitter
Ean
@redsoxz4life
What do you get when you combine a Christmas tree with an iPad? A pineapple.
7:41 PM · Dec 5, 2013
   
Twitter
Joe
@joefrgee
What do you get when you combine a Christmas tree with an ipad ? A Pineapple
9:04 AM · Dec 6, 2013
 
Google Books
Reader’s Digest Funny Family Jokes:
Something for Everyone
By the Editors at Reader’s Digest
New York, NY: Reader’s Digest Association
2014
Pg. ?:
Q: What do you getwhen you combine a Christmas tree with an iPad? A: A pineapple
 
Reddit—Jokes
Posted by u/johnnetherlands October 12, 2015
What do you get when you combine a Christmas tree with an iPad?
     
Twitter
𝔗. ℭ𝔥𝔞𝔡 𝔚𝔦𝔫𝔡𝔢𝔯
@tchadwinder
Replying to @LloydLegalist
this is all wrong, a pineapple is what you get when you mix a Christmas tree with an iPad… #blankstare #thunderousapplause
7:23 AM · Dec 1, 2016
 
Reddit—Jokes
Posted by u/beaver_82799 December 24, 2016
What do you get when you combine a Christmas tree with an iPad?
A pineapple
     
Men’s Health
The 60 Funniest Christmas Jokes to Make Your Kids Laugh
What do you get when you cross a snowman with a vampire?
BY ERIC SPITZNAGEL AND JOSHUA ST. CLAIR PUBLISHED: AUG 27, 2021
(...)
What do you get when you combine a Christmas tree with an iPad? A pineapple.
   
Woman’s Day
150 Funny Christmas Jokes for Kids and Adults
From Santa jokes to reindeer puns, and every corny Christmas one-liner in between.
BY NI’KESIA PANNELL PUBLISHED: SEP 13, 2022
(...)
What do you get when you combine a Christmas tree with an iPad? A pineapple!
   
USA Today
160 funny Christmas jokes ‘yule’ love this holiday season
Clare Mulroy
Published 6:00 a.m. ET Nov. 10, 2022
(...)
What do you get when you mix a Christmas tree with an iPad? A pineapple.
 
Parade
150 Funny Christmas Jokes for Kids and Adults
Laugh along with the 150 best Christmas jokes in 2022.
MARYN LILES DEC 21, 2022
(...)
35. What do you get when you combine a Christmas tree with an iPad? A pineapple!
 
Twitter
GNolan
@GNolan01
What do you get when you mix a Christmas tree with an iPad?
A PINEAPPLE!
4:48 PM · Dec 23, 2022