My dealer said he lost a blade once and it went thru both sides of his back tire and another 200 feet out thru the grass. The blade had broke at the pin. This is one of those things that you cant anticipate. A bushhog is not like an aircraft turbine that you inspect every time you use it and magnetic particle/dye penetrant test the blades at certain intervals. You just have to use caution and keep onlookers out of the area. I flinch every time I pass a roadside mower. Beyond danger of broken blade is the possibility of slinging some hidden trash at you.