The Gambling Ghosts

3 years back, me and friends went to this hill resort with casino, Genting Highland. This is where we get to gamble legally in Malaysia. We stayed in a hotel at mid hill. After a day at the resort we went back to the hotel to rest... and soon after we started to play game of cards. Then few minutes into the game, we started to hear someone knocking on the door, lightly and in some period of 2 seconds each knocks. My fren went to check it. and as soon that he peered trough the "spyglass" on the door. The knocking stopped. We ruled it out as kids although we dont hear any sounds of laughter or footsteps. As we get back to playing... the knocking came again... this started to freak out the few girls which are with us. My friend with a furious leap, ran to the door and open it and got out.... but there was no one there... and sure enough the knocking stopped. He started to scold into the empty corridor about not playing with our door. Then he came in and close the door. and as it closes shut. there was this bang on the door as if someone bang on it with a fist angrily. then all was silent. we were kind off freaked by this and decided to pack our things and head to another hotel on the hill top.. just in case..