The NTU Hungry Ghost Festival
It happens for 2 time periods in a year. Yes, its the NTU Hungry Ghost Festival.
Thats when the 'gates of hell' are opened, and hoards of 'hungry ghosts' storm out to look for food.
In the case of NTU, well... Just watch it yourself :)
This is actually last semesters video. I wonder what is the population of the 'hungry ghosts' now.