gengar

—while you were sleeping suddenly in the middle of the night you woke up and heard something like a creak of the wooden boards under your bed and with some fear you looked under the bed and saw in the darkness under it two red eyes looking at you and one chilling smile that made your blood flow and suddenly you heard how that strange creature said in a dark and somewhat whispery voice

"gengar... "

—while still smiling and looking at you