Has anyone here ever experienced a ghost or haunting firsthand?

I have not, but I talked to a totally reliable person who did. She awoke suddenly to find her husband standing by her bed. He was sleeping in another room because he was unable to walk and needed special equipment. Her husband spoke to her and told her to fetch some important papers that he had stashed in a hiding place. Then he vanished. She went into his room, and he was dead. She found the papers, just like he told her.