ThinkGeek just added two neat mugs based on your favorite classic arcade games: Pac Boy and Space Intruders. Alright, so they're totally knock-offs, but what's cool about them is they're heat sensing, so they initially display an empty maze and clear sky if you don't have anything warm in the mugs.

But when you pour hot coffee or any other warm beverage in, pellets and ghosts appear to haunt your mug (or aliens fly in to invade your drink). You can see a video demonstration of the heat-changing magic after the break. Both mugs are available to purchase now for just $7.99 before shipping/handling.