Perhaps the Kents' house has been physically altered by the UFO to defy the laws of physics.

Or, maybe it's like the Tardis in Dr. Who. Hmm...crossover, anyone?

I believe there's a hero in all of us that keeps us honest, gives us strength, makes us noble, and finally allows us to die with pride, even though sometimes we have to be steady and give up the thing we want the most. Even our dreams. -- Aunt May, Spider-Man 2