When you add hot liquid to the mug, the screen fills up, and as the mug cools down (or, more likely, sits empty) the aliens disappear and it looks like you’re about to win the level. Which makes sense since now you’re thinking with caffeine.

Space Invaders heat-changing mug.
Officially-licensed Space Invaders product.
Capacity: 11 oz.
Materials: Ceramic.
Ages 12+.
Not microwave or dishwasher-safe