Yo me too. I was doing dishes while the GF was showering. I heard 3 loud knocks as if it were in the front door window. I went to look, turned on the outside lights and nothing there. Not even the slightest wind. 3 loud knocks.
I was a little scared and went up to the bathroom and told my GF of this event. She said " Oh, well hopefully it was just your imagination"...... it wasn't .... this was loud knocking ... tock tock tock.