“How do you turn white chocolate into dark chocolate?”/“Turn off the light.”

A chocolate riddle is:
 
Q: How do you turn white chocolate into dark chocolate?
A: Turn off the light.
   
The joke was posted on Twitter on January 9, 2013.
 
         
Twitter
Hamish James
@mrhamishjames
Replying to @CherylOfficial
@CherylCole how do you turn white chocolate into dark chocolate? Turn off the light! x
3:52 PM - 9 Jan 2013
   
Twitter
prince
@daegusbling
How do you turn white chocolate into dark chocolate?
Turn off the light.
@EthanDolan
7:54 AM - 18 Jul 2015 from Bicol Region, Republic of the Philippines
 
YouTube
Jokes - How do you turn white chocolate into dark chocolate? Turn off the light.
jokesus
Published on Oct 2, 2015
Joke :
How do you turn white chocolate into dark chocolate?
Turn off the light.
       
Twitter
Sachiko 💝 🐶 AlDub
@SachikoBebeh
Q: How do u turn white chocolate into dark chocolate?
A:  Turn off the light..
Tweet Pa More!..nyahaha!.. @cortezlisa28 #ALDUBHALFWayThere
12:00 AM - 21 Oct 2015
 
Times Free Press (Chattanooga, TN)
Punchlines
November 29th, 2017 by Lisa Denton in Chattnow Outabout
(...)
Q: How do you turn white chocolate into dark chocolate?
A: Turn off the light.
 
Twitter
Upbeat Care
@upbeatcare
FRIDAY JOKE: How do you turn white chocolate into dark chocolate? Turn off the light… #BadJokeFriday #jokes #chocolate
7:15 AM - 9 Mar 2018