Sorry to keep you all waiting for this story....
One ex staff told me that a security officer told him this happened
to him:
That night, the zoo closed at 6 plus as usual. After that, it was
opened for Halloween event. They did this every year, either in zoo
or night safari. That year, I think they have some halloween
party.
Not sure what time the party ended that night. But about two or
more hours after it ended, a security officer doing graveyard shift
at the zoo gate saw a man inside the zoo, near the entrance, tram
station and the gift shop. The location was quite near to the
entrance, so the staff could see the man.
The man was squatting down next to a pillar shivering. He walked
near him and saw that the man had scars on his face. He thought he
was one of the halloween party participants. He told him politely
that the party was over and he had to leave the place. The man got
up and the staff walked him out of the zoo. As the staff was
walking with the man, he noticed something was not right. The man
was walking without having his feet touch the ground. Basically the
man was floating. The staff remained calm and pointed out to the
way to the bus stop. The man just continued "walking" towards the
bus stop. The staff quickly turned around and walked back to his
work station without turning back to see the man.