Ten years ago when horror filmmaker Cheang Pou-soi was working as a production assistant, he witnessed what he and the rest of the crew concluded could only be the antics of a mischievous ghost.
They were filming in the abandoned psychiatric hospital known as the 'High Street haunted house' in Sai Ying Pun.
A spotlight was set at the end of a corridor on the first floor. When the camera started rolling, the crew saw a person shake the light.
'We yelled at the person and he ran off to the side - just disappeared,' says Cheang. 'But later on, we discovered that there was no way for a person to escape like that, because there were no doors but only walls and a window at that far end. To go sideways he must have walked through the wall.'
The sun is shining outside the lobby cafe at Shangri-La, but hearing Cheang tell his freaky tales, I feel a cold chill down my spine.
The High Street ghost house was not the worst experience for 31-year-old Cheang. The set for his latest film, The Death Curse, was probably the scariest place he has ever been.