Yellow
Sam's favorite color had always been yellow, it was the color of the sun, and Sam loved the sun, it chased the darkness away.
So when he saw the yellow Camaro in Uncle Bobby B's used car lot, he had felt an instant attachment to it.
Discovering his awesome yellow car was really an alien in disguise, who also chased away the darkness, had been a really cool bonus.
Huge Thanks To: Joyfull Scroll for all the reviews!