As a third year Industrial Apprentice back in 1989, my company had just spent $7500 on a telescoping lift, for changing high bay lights mostly. We’ll I had just finished changing a light and had descended, it was close to break time and I was ready to finish up (read as rushing). Pushing the lift back to where we stored it, it suddenly made a loud bang and I looked up in time to see the top going back the way I had just came, and then like a boxer KO the whole thing crashed to the floor. Luckily nobody was behind me to get hurt. That was when I remembered the lift only had 2” of clearance under an I-Beam, in my haste I guess I didn’t get it all the way down. Thought for sure I was fired, but company claimed on the insurance, but the unit could not be repaired and they had to get another new one.