A man dove headfirst into 200°F thermal water to try to rescue a dog. Both died.

A tragic story of acting without thinking resulted in the death of a man and a dog at a Yellowstone geyser in 1981. According to rumor-debunking website Snopes, a man was visiting the Celestine Pool when his friend's dog escaped and fell into the 200°F pool. The man dove headfirst into the spring in a valiant attempt to save the dog. Alas, the man suffered third-degree burns to his entire body and neither he nor the dog survived.