Unfortunately yes. 5 years ago was on the incline bench in the smith machine flat out pumping up the upper pecks for my low cut t-shirt. Had 2 x 20 on each side and no counter weight on this one, so relatively heavy, when the fucking pin in the bench failed, bench collapsed, bar followed very shortly after, thank fuck my partner was switched on and quick off the mark. Amazingly the 100kg that fall on me didn't damage me, what's fucked me was the back of my head smashing the bench as I was pressing hard when the support dissapeard and reappeared a foot lower.
Tell you what, till this day I now check the all the locking mechanisms twice before I depend on it, the feeling was: confusion, shock, pain, fear and finished with anger, took a week to recover, migraine went for 48 hours.