How do you know...

How do you tell the difference between a person on a cell phone and a schizophrenic? I mean really? They both hear voices in their heads. They both seem distracted and lose track of their surroundings when walking. Both have erratic driving behaviors and seem to be carrying on conversations no one else can hear. I don't see any difference at all.

Maybe cell phones are a shared delusion and we are all just plain crazy.