Well, I did a real dumb thing about 11 years ago. I had this flute-style glass flower vase, and it looked perfect for masturbation. The right width and length. So, I opened this old trunk I had and put it between the open lip and the lid. When I got on my knees it was the perfect height. Well, it was working great until I put too much pressure on the lid and it crushed the vase with my cock inside it. I put the pressure on it right when I was cumming, and it severely severed my dick. There was blood everywhere, and I had to have emergency surgery. The wounds were superficial and I had 30 stitches in my cock. It was extremely painful and I contemplated suicide many times, and almost did it once. I have lived with the terror and humiliation beyond all description.
I realize that others think it's funny, but I have very painful flashbacks and I've never been able to have another relationship or sleep with a woman since. I doubt I ever will. My cock has a barely visible scar on it, but it is there. Often I think back to it and I can barley overcome my shame.