The Jackhammer is an easy move to get wrong. If your elbow is out of place when you bring the other guy down to the slam then the recipient has severe problems with his testicals. No jokes about crappy mid carders please!
But anyway, Goldberg isn't the only wrestler whos known as clumsy and/or stiff, there's also Jerico (both), Lesnar (stiff), Show (BOTH!!) ect ect....
All 3 of those I mentioned have held the world title and been damned lucky not to have seriosly hurt someone, or themselves. And Bret was lusky compared to some, look what a decent "technical" wrestler did to Droz!