It happened to my cousin. It happened at night at Bedok Reservoir Park.
Although it was late at night, my cousin with some of his friends were cycling around the park. There were nobody there. It was a total darkness and very quiet except for noises of vehicles pasing by the road.
A few minutes later, they smelt something like a dead animal or a corpse. Not far away from them, they saw a plain white cloth and black plastic bag on the grass.
All of a sudden, the white cloth moved. All of them cycled away quickly. When one of them looked behind, they saw a girl in white floating and it seemed to be following them home.
When they reached their block of flats, there were no signs of the girl again. They got so terrified that they never ever want to go there at night anymore.