If old arcade games (and hot drinks) are your thing, you might just like this Pac-Man heat changing mug.
An officially licensed product via Namco, the mug holds your hot drink and does something else – when a hot drink hits it, the characters and power-ups suddenly appear within the maze on the side. Presumably, when it cools, they go away again.
You can get one from Firebox, priced at £5.99.