I went on a no heat call the other day, got the furnace going, and was leaving the mechanical room. I noticed the door for the water heater was laying in the floor. The w/h was fairly new, I leaned over to put the cover on the w/h and smelled gas. So I get the HO and my Big Blue bubbles, I knew where one leak would be, But I checked the other fittings as well.
It's a wonder some peoples' ignorance doesn't get them killed.