In 2003, mountaineer Aron Ralston was canoyoneering in Utah when a boulder pinned his arm against a canyon wall. After 127 hours of battling dehydration, starvation, and the elements, Ralston resorts to amputating his arm with a small knife from a cheap multitool. Based on his autobiography Between a Rock and a Hard Place, Danny Boyle (Trainspotting, Slumdog Millionaire) has adapted the dramatic story with James Franco portraying Ralston into the aptly titled film 127 Hours.