Saw blades...

Much as I'm aware of the masses of ignorance on both sides of the pond they have a sort of valid point here depending on the circumstances. Even if stacked horizontally someone will have to pick them up at some point, if they don't hold it perfectly level or if they get jostled for any reason the blades could come loose and end up causing injuries to forearms, legs, feet, or any other body part in the vicinity. While in many cases the injuries may be relatively minor this cannot be guaranteed and would likely lead to a lawsuit, especially in the US, in either case this is not acceptable for packaging of a sharp object. Any idiot should know that sharp objects should be handled with care, this includes ensuring you don't place them in a container where they have a likely chance of falling out and landing on part of an individual.