Soooo, why not have a microwave that actually causes the molecules to move slower and therefore cool stuff down quickly. This would be invaluable if you wanted a long cool drink but had forgotten to take the beer out of the car on a sunny afternoon.

Golfers could cool there balls down (colder air is more dense and therefore has more lift and therefore golf balls will fly higher and thus farther if they are cold).

You could use it to refresh that cold water bottle for those hot summer nights in bed