I had an experience of seeing a ghost(excluding the times I have felt one and heard weird noises) but not in HK.
It was back in 1996 when I was still in University. I stayed at a house with my friends. We move every year. In Summer 1996, we moved to a new place and in the evening(on the same day), my friend asked me to take him back to the old house to pick up sth. So, I drove him back to the old house. After we went in to the house, I called my gf(back then) while he was searching for his stuff. After a little while, he told me he has found his stuff and he is ready to go. Since I have not finished chatting with my gf, I told him to go back first (BIG MISTAKE!!!)and I'll call his mobile when I am done so that he can come back and pick me up.
After he has gone, I kept chatting with my gf sitting on the floor next to the main entrance. After a litte while, I felt a breeze. Not from the outside but from the corridor in the house. I felt kinda scared but I think it was just some air circulation since i have the front door opened. After a few minutes, the breeze was getting stronger and stronger and I felt really uncomfortable and cold. I could actually felt the breeze going in circle around me. It made my body moved slightly in a circular motion. I got really really scared. I tried to pray but I was too scared to do anything. In fact, I couldn't do anything - can't speak, can't move, can't think. I was so scared that I was up to a point that I though I was going to faint. At this very moment, a "lady" appeared in front of me. The distance between "her" and I was about 5-6ft. She was floating in mid-air. She is a foreigner. She was wearing a dress and she has dark curly hair. Her whole figure was in black and white color. Then, she looked at me in the eye and I nearly had a heart attack because her eyes are all white - no pupil..........then she started floating towards me and my mind was totally BLANK so I just sat there. It kept floating and floating until she was nearly 1 ft from me, she vanished right in front of my eyes. It might sound like this incident lasted for a fair amount of time but the whole thing lasted for only 1 - 2 mins. I can hear my gf kept asking me "Are you there? Are you there" but I couldn't speak at all. After I sat there for another minute, I told my gf to hang up and my friend has arrived. I ran out of the house and jumped into the car. My friend asked me what happened when he saw my face. He said my face was really pale. I told him I'll tell him when we get home. After we have arrived home, I told him what happened. His reaction was - "No wonder".........I was surprised with his reaction, so I asked him what does he mean by "No Wonder" then he said.......TO BE CONTINUED