The other day, I saw my brother sneeze in a dark room with a single light. I saw his sneeze lit up, with fine droplets shooting out several feet at 200 miles per hour (as I have been told).
I thought that instead of breathing fire through your mouth, you might try to sneeze it out. Since there is
no category (that I could find) for fire-breathing, I decided to put the idea here.
The fuel would have to be something that would irritate the mucus membranes but would also be non-toxic and flammable.
You could also use this as a way of atomizing fuel in a car, although you would have to use several passangers to make the fuel supply consistant. It might be best for a large bus or van.
It would not be practical or healthy for the passengers, but would probably be better than a flattulence-powered vehicle (excluding the use of bean burritos).