My !@#$%^&* House Bit Me.

I took my daughter on a tour of my neato attic today.  We have two rooms up there.  There are columns from a georgian porch the was removed years ago, 6 or 7 doors spanning 2 hundred years of the house's history. According to the previous owners there were slaves quarters in there.  So anyway, I'm stepping from one room to the next across a gap in the floorboards. I'm looking at the boards and not paying attention to the top of the door and how it's 4 inches shorter than the door across the hallway. BAM! Suddenly I'm seeing stars and there are tears welling up in my eyes. I have never hit my head this hard. Anything that hurts this much should be bloody.  That's all I'm saying.  I have a knot on my head the size and shape of a banana.