A Malaysian lad put a large metal nut on his penis, in hopes the weight will make it longer. Unfortunately, he later had an erection, which caused the non-stretchy bolt to pinch off the blood vessels, leaving his dick hard, painful, and nearing a reason to have it removed completely. Doctors, fortunately, were able to drain some blood, remove a little skin, and bring the man's penis back to "normal", hopefully with enough of a mark to remind him not to do that ever again. Why don't people realize, stick your dick into soft things. It's much more comfortable.