This is my worst nightmere. I always double check everything before I shut down the shop at night. If I put my car cover back on I make sure my exhaust isn't real hot still. The one thing that makes me nervous is leaving a charging battery. I do it every day at work but for some reason I think twice about doing it in my own garage.
What's scary about this is...you can check everything THREE times but you still never know what the house next door is doing. If it burns, your house is probably going up too.