one of the companies I worked for had the whole boom come off the truck at the turret and killed the operator, they showed us pictures of the failure, the bolts broke in the turret....
another had the upper cylinder break and dropped the operator from 35 to 40 feet high back down on the head ache rack, he didn't get killed but his career ended that day....
guy that worked with me had an uncle who was killed when the upper boom broke right next to the bucket and dumped him out from 50 feet high.....
heard a story of the boom cable breaking and the upper boom came crashing back down and when it stopped the operator was slung out from the recoil of the boom...
the last two weren't wearing a harness...