Looking back at time, many say that the 80's was a golden era in Singapore. We can never go back to the 80's, but for the very least, we can reminisce the memories back then.
Many Singaporeans living in HDB flats claim that they have somehow heard irritating marble dropping sounds above their units at night. When they try to investigate, it always turns out that their neighbours above have no children, or it is an empty unit, or simply children nowadays do not play marbles anymore.
Many try to come out with 'scientific' explanations about this phenomenon; echoing sounds from the pipes, or sounds of expansion / contraction of the steels in the ceilings, but some will rather believe it is a young ghost dropping its marbles around, creating the 'tok tok tok' sounds.
Another sounds commonly heard is the dragging of furniture at the unit above.