Something Happened Last Night - Paranormal

I was awakened last night around midnight by the sound of tapping on my window and what I thought was a faint "Hello" outside. 'Tap tap tap,'.. Hello?'
Being still half asleep I thought to myself "That must have been the sound of the wind, And the nearby tree branches lightly touching the glass"
It wasn't until a few moments later that I was frightened out of my room when I heard it for a second time. I realized the sound had been coming from my mirror. -