Is it normal this hapoened to my great grandpa.

ghosts are real

Grief can do strange things to a person's psyche.

Those demons do love a good giggle.

It's not normal in the sense that seeing a ghost or a demon is generally an abnormal thing. But yeah, ghosts are demons imitating dead people's actions or whatever.

My grandmother used to tell me this happened to my great grandpa.

His wife died and then he buried her. Back then, in my country, they would dig a hole and place a large flat stone on top of the hole. When he finished everything (digging the hole and all), he was ready to leave and before he turned around, a voice from within the grave said:

“You’re going to leave me in here, love?”

My great grandpa, being the badass man he used to be, responded:

“FAKE AND GAY”

He heard a hysterical demonic laugh as he walked away from his wife’s grave.