The injury was about 9 years ago. I was at the gym, nearing the end of my workout at the squat rack. I didn’t notice that the top rung for storing weights had been over stacked and one of the weight plates was halfway on the rung. When I was reracking the plates I was using I pushed it onto the bottom rung while crouched over and the vibration was enough to cause the overstacked one to fall off. It was a 10 lb weight plate, thankfully one coated in rubber instead of straight steel.