William LaFever, a 28 year-old autistic man attempted to walk 90 miles from Boulder, Utah to Page, Arizona. On his journey, he ran out of food and was nowhere near civilization. He resorted to catching frogs to eat, and drinking from the river he’d luckily stayed close to. LaFever was lost for over two weeks when a helicopter crew found him. LaFever was too weak to even crawl when found, and had just been rolling in and out of the river to sleep or cool down.
Source: Cnn.com