Scary Tales #3

I and my sisters Cez and Nala stayed up late one night watching Tatak Pilipino on TV; we were hanging out in the den. That episode was particularly interesting because it was about Philippine folktales and mythical creatures as well as some horror stories. A loud banging suddenly issued from the window. We never found out if it may have just been an animal or someone trying to scare us, but if the latter is correct, then who was it?