Egolifter nearly kills himself in Brazil:
What you're looking for is a man in a gray tank-top sitting on top of a hack squat machine's pedestal.
BtuVckyAH4clwm7V.mp4
150 kilos fell right on his back. He immediately fainted. He's undergone a 4-hour surgery and is said to have "less than a 1% chance of regaining control of his legs".
I don't think it's known exactly what caused the machine to do this. It's possible that either the lock malfunctioned or that he didn't engage the lock properly. The gym has stated that the machine was brand new and working perfectly.
Additional footage from before the incident can be seen in this report, and also an excruciating X-ray of his spine:
From this you can see that he was half-repping the exercise, and yet decided to add more weight after that set. A lot of things went wrong here to lead to this. Very unlucky, and possibly not his fault if it the machine was faulty, but I'm willing to call this a Darwin Award. Disrespecting gym equipment is like playing with guns.