Tap-Tap

On a cold, dreary night I hear the wind whistling through the trees.
 As I sit in my chair with a book in my hand I hear Tap-Tap Tap-Tap.
I get off of my chair and look around but no one is there.
 I sit down to finish my book.
20 minutes go by and I hear the noise again, Tap-Tap Tap-Tap.
I get off of my chair and look around but no one is there.
 I sit down to finish my book.
 Another 20 minutes go by and I hear it again, Tap-Tap Tap-Tap.
I get up again to look around when all of a sudden I hear, Tap-Tap Tap-Tap,
 coming from behind me.
I slowly turn around and see……
 
A GHOST IN THE WINDOW LOOKING AT ME!
 TAP-TAP TAP-TAP!!!!