I believe there have been mentions of spirits for as long as humans have existed. At least as long as humans have recorded history they have recorded encounters with spirits.
I mean, how come there are no reports of caveman ghosts today? Do ghosts only have a maximum of a 300 year lifespan or something?
Anyway, here's my story. Once I was sad so I went to a cave to think to myself. As I was there some ghostly figure appeared before me. The figure said:
"Proclaim in the name of thy Lord and Cherisher, who created man out a clot of blood. Proclaim! And thy Lord is most bountiful. He who taught use of the pen, taught man that which he knew not!"
That freaked me out, so I left the cave. But then I returned later. And when I was midway on the mountain, I heard a voice from heaven saying "Hammerhead636! You are the apostle of Allah and I am Gabriel." I raised my head towards heaven to see who was speaking, and Gabriel in the form of a man with feet astride the horizon, saying, "O Hammerhead636! You are the apostle of Allah and I am Gabriel." I stood gazing at him moving neither forward nor backward, then I began to turn my face away from him, but towards whatever region of the sky I looked, I saw him as before.
It was quite the sight to behold.