If you like Doctor Who and mugs then you have to check out this Tardis heat changing mug.
The Tardis mug is Black with the Tardis at night and of course the Doctor Who logo and then when you fill it with a warm drink it changes into a nice Tardis blue mug with the Tardis all clear on it. And even inside the mug you find Doctor Who details like the famous DW logo that looks like the Tardis.
Now you can just show your dark side in the morning and the mug looks like you and then you put hot coffee inside and it all brighten up just like you do after your morning coffee.
Get your Tardis Heat Changing Mug