According to the Denver Post, avid outdoorsman and climber Aron Ralson amputated his right arm with a pocket knife after becoming pinned by a 1,000 lb. boulder for 5 days while climbing at Canyonlands National Park in Utah. He ran out of water after 3 days and decided he needed to amputate after 2 days in order to escape and survive.I can hardly imagine being pinned for 5 days under a boulder. I’d imagine the arm would go numb after a while, but trying to sleep would just suck. Let me just say I never want to be in a situation that requires even considering amputation, thankyouverymuch.