an open mind is sign of a healthy mind

I completely agree with this, having an open mind is important so we can more easily adopt new ideas.

as schizophrenic episodes through out their lives

It might happen, but how many times do you think something like that can happen to a healthy person in his entire life?

Have you ever asked yourself what if the crazy guy was not crazy?

If the guy is not crazy then why did he see people looking at him in the mirror? Or why did he thought he had someone on the other side of a phone call that never happened? Why would a healthy person experience those things?