These still make me cringe!!!
First while 18 years old, working out in wrestling shoes I was taking a 55 off one side of a bench, then went to take the other 45 off the other side, BUT I didnt see the 10lb plate on the other side, so SLAM the 10 LBer came down edge first on my little toe-lost the nail for 4 years
Secondly- few years back while doing snatches, the bar came down so fast on my forehead that it started to bleed.
Thirdly- while heavy deadlifting I lost my balance and dropped the weight and fell into a "butt blaster" machine, ripping my knee open needing stiches
Forth- while training at a shitty gym I visited I went to squat and they had no collars and shitty bars, at 495 on the third rep the weights were giggling, falling off the sides while I standed there, finally the bar flipped off to the side all the weight fells off and I torqued my back and couldn't train for 3 weeks
Fifth and most painful bout' 8 years ago was doing reverse grip triceps with a straight bar on a cable and I lost my grip and the bar came smashing up into my chin, never been right since.