“Swallowing, he entered the second code. Then there was a sound like a marble dropping on the floor - bouncing slowly, gradually getting faster as it dropped lower and lower… The thing was toying with him! Where was it? He strained his hearing, but all was again silent. He wanted to shout and scream obscenities at it, but he fought the impulse. It might not really know his location after all - and that would've led it right to him. It must be coming for him! It must be by the door by now, looking for a way in. Time was running out. He hastily keyed in the third and last code. Death the destroyer never is late!”
Book:Demonspawn