Ghost experiences?

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I remember when we were in a review for the board exam in Cebu. We were awake late at night studying with all the lights lit. It was a bit warm but we did not turn on the fan. Suddenly, a gust of cold wind blew from behind us and we saw a figure of a man walking past beside us. He was wearing a white polo and a light colored pants. His movement (coz I didn't think he was walking) was like gracefully floating in the air or levitating. It took us about a minute to react, ask each other if we've all seen him and we did. We wen to our rooms, called our landlord and described to him what we saw. He said, the man was his dad. And he passed away years ago. Creepy! Tell me your story about ghosts.