I was lying on my back in the crawl space, trying to find the source of the smell of a faint gas leak. My wife was above me in the utility room where I had just run a gas line for a clothes dryer to be installed. I asked her to make sure that the shut-off valve was turned off, all the way to the left. She said she did. I asked, “All the way to the left, as far as you can turn it.” She said she had turned it. The smell of leaking gas was stronger. I screamed, “Are you sure the valve is off?” She said, exasperated, “I turned it all the way to the left. The valve is off. It is now on the floor by the pipe.” I scooted out of the crawl space and got to the meter to shut off the gas more quickly than I could have imagined.