For centuries mankind has pondered such questions as: What is the sound of one hand clapping? If a tree falls in a forest and no one is around to hear it, does it make a sound? Now a Spanish man is accused of adding another philosophical riddle to the mix; if you have your boss killed can you avoid being laid off? Police say that the head of audiovisual services at the Barcelona International Convention Center hired a Colombian hitman who killed the director of the convention center. Investigators say the director planned to lay off the arrested man as part of a restructuring project.