Alamak, you all misunderstood liao lah... My study room can hear the stones in late evening or before midnight. No ghost lah! "Boh Koh Ling" is toilet mah... Not that type of pipe flowing sound, I heard those before. Just imagine those grey type(can be found at MRT 1, big and no definite shape 1) of stones being throw onto the ground. It is 10x louder than marbles being dropped onto the floor
boh eng, I didn't hear water sound. If can hear is only the stones cos they shifted(rub against ground) and throw into the fountain.