“Yes, it is.”/“Is time travel possible?”

A time travel joke was posted on Reddit—Shittyaskscience on April 12, 2012:
   
“Yes it is. Is time travel possible?”
   
   
Reddit—Shittyaskscience
Posted by u/SmellsLikeUpfoo April 12, 2012
Yes it is. Is time travel possible?
         
Twitter
shut up, xavier
@XavierRN
Yes it is. Is time travel possible?
9:57 PM · Apr 12, 2012·Twitter for Mac
   
Twitter
Juan Simon
@Xunik_Ximon
Yes it is. Is Time Travel possible?
10:27 AM · Apr 16, 2012·Twitter SMS
   
Twitter
Jonny Hercus
@Yeah_Jono
Yes it is. Is it possible to time travel? #science
10:11 PM · Apr 25, 2012·Twitter Web Client
 
Twitter
MΛSTΞR β∂ΚΞℜ ☭
@BakedG00dz
Yes it is. Is time travel possible?
9:06 PM · Dec 12, 2013·Twitter for Android
 
Reddit—Shittyaskscience
Posted by u/Flaminate July 31, 2015
Yes it is. Is time travel possible?
     
Reddit—Jokes
Posted by u/Rey_Ban April 12, 2016
Yes It Is
Is Time Travel Possible ?
 
Reddit—Cleanjokes
Posted by u/kickypie May 22, 2021
Yes It Is
Is Time Travel Possible ?
 
Twitter
The Dad Joke Man
@DadJokeMan
Yes it is.                                                                                                       
Is time travel possible?
#BackToTheFutureDay
6:07 AM · Oct 21, 2021·Twitter Web App