I had a boil-over on a turkey fryer burner, with a large kettle that was full of a Russian Imperial Stout--with black strap molasses. The smell was an amazing caramel smell, but what a mess it made. It was in the garage, but who wants over a gallon of malt syrup and molasses ripening on their garage floor. Everything by the kettle was coated--including my shoes. I also boiled over an extract batch on the kitchen stove. didn't think my wife was going to tolerate another batch after that one. "A watched pot never boils, until you look away for just a second."