Xbox is a video gaming brand from Microsoft. “Xbox” should not be confused with “ex box,” but there are jokes.
     
“I’ve just got my son a flat piece of cardboard for Christmas. Although what he wants with an ex box I’ll never know. RT @comedyclipsblog” was posted on Twitter by FunnyOneLiners on December 20, 2009. (The original tweet is no longer on Twitter.) “I just got my son a flat piece of cardboard for his birthday. I have no idea why he was so desperate for an ex box” was posted on Reddit—Dadjokes on May 31, 2020.
       
“Why doesn’t Mike Tyson use a PlayStation?”/“Because he’s an X-Boxer” is another Xbox joke.
     
     
Wikipedia: Xbox 
Xbox is a video gaming brand created and owned by Microsoft. The brand consists of five video game consoles, as well as applications (games), streaming services, an online service by the name of Xbox Live, and the development arm by the name of Xbox Game Studios. The brand was first introduced in the United States in November 2001, with the launch of the original Xbox console.
         
Twitter
JJ Timson
@jjtimson
I’ve just got my sister a flat piece of cardboard for Christmas. Although what the daft bastard wants with an ex box I’ll never know.
9:30 AM · Dec 19, 2009·Twitter Web Client
 
Twitter
FunnyOneLiners
@Funnyoneliners
I’ve just got my son a flat piece of cardboard for Christmas. Although what he wants with an ex box I’ll never know.
RT @comedyclipsblog
8:46 PM · Dec 20, 2009·Twitter Web Client
   
Twitter
*** Dazzle ***
@dazz1one
My friend got his son a flat piece of cardboard for his birthday. 
Although what the daft sod wants with an ex box I’ll never know.
7:40 PM · Aug 13, 2011·Tweetlogix
   
Twitter
Nigel Ball
@MCBusRider
I’ve just got my son a flat piece of cardboard for his birthday.Although what he wants with an ex box,I’ll never know.
(S&B,Sep 2011)
3:45 AM · Sep 5, 2011·Twitter for iPhone
   
Twitter
Dad Jokes
@Dadsaysjokes
I just bought my son a flat piece of cardboard for Christmas.
I have no idea why he wants an ex box.
4:14 PM · Dec 2, 2018·Twitter for iPhone
 
Reddit—Dadjokes
Posted by u/porichoygupto March 24, 2019
I decided to get my son a flat piece of cardboard for his birthday.
He keeps asking for an ex box, so I’m sure he will be delighted.
   
Reddit—Dadjokes
Posted by u/porichoygupto May 31, 2020
I just got my son a flat piece of cardboard for his birthday.
I have no idea why he was so desperate for an ex box.
 
Reddit—3amjokes
Posted by u/Perfumo August 3, 2020
I bought my son a flat piece of cardboard for his birthday…... Though, why on earth he wants an ex-box, I’ll never know.
   
Twitter
Bob Kostic
@causticbob
I’ve just got my son a flat piece of cardboard for Christmas. Although what the daft bastard wants with an ex box I’ll never know.
6:37 PM · Dec 2, 2020·Twitter Web App