As the caped crusader, Batman, aka Bruce Wayne, often needs to get up in the middle of the night to enforce law and order on the streets of Gotham. As such, it should not come as a surprise that he has ordered Alfred to keep a pot of piping-hot coffee on the stove at all times.

Obviously, he only drinks his coffee from the DC Comics Gotham City Heat Change Mug. This mug depicts the skyline of Gotham, but when you add a hot liquid, the scene changes: the Bat Signal flares up, green gas floods the streets and the Joker’s laughter can be heard (or rather read, in this case).

We’re sure the caffeine-fuelled Batman will put a stop to this in no time!