One of the better product reviews i've seen:
"This mug is so magic I have now been out cast.
Well, my OcUK heat transfer mug arrived this morning, at first, everything was fine. The mug looked great and I could see that it was elite tier.
I put my coffee in, my sugar and waited for the kettle to boil (notice I didn't put milk in before the water... I'm not an animal!), once the kettle boiled, I put an adequate amount of water in to enable me to make a proper brew.
This is where the problems start. Almost instantly the mug started to change colour, I was amazed. The problem is that others saw this wizardry and jumped to the conclusion that I was in to witch craft. They instantly called up the local hardware store to ensure there were enough pitchforks and torches and started to drive me out. I had to leave my brew, myhome, my partner and most importantly, my computer behind.
A few hours later once I was out of the vicinity of the brew, they noticed that the colour had changed back, confirming their fears that it was I who had an effect on the mug.
I am now an out cast, a loner, a weirdo. Be careful when using this product, with great power comes great responsibility. Always remember."
https://www.overclockers.co.uk/official-overclockers-uk-heat-transfer-mug-wc-088-oe.html