Plumb crazy

The plumber is here to enable me to hook my lampworking torch into our natural gas line in the basement. That way I don't have to store tanks or lug them to the welding supplier for a refill. I have a healthy fear of flammable materials, flooding, and electricity, so I leave systems work to the pros. I heard the plumber ask his assistant, "You turned the gas off, right?" Famous last words...