a sneeze that kills

I was walking down the hall from my room to go downstairs. My dad was working at the room just at the top of the stairs; I could hear him typing his loud, chicken-pecking way. (I usually have him shut his door when I am asleep because I can hear this from my room with my door closed) Just as I reach the top of the stairs, I hear a thunderous boom that makes me jump out of my skin and causes me to scream bloody murder. Then I realize, oh. That is just my dad, sneezing.