I’m pretty sure this item was created when the Tardis was whisked away to an alternate universe. The doctor tried to course correct by hitting the main console with a hammer, which had the strange effect of reversing the Tardis’ inside with the Tardis’ outside. So what you were left with was the icy cold and blackness of space inside the tardis, while the universe outside was now the Tardis interior.
Weird. I forget how they got out of that one, but what I can tell you is that this Tardis Ice Bucket is perfect to have on hand while serving ice cold drinks and trying to get Rose Tyler drunk. It only costs £17.99. Brilliant!