In 2004, while he and his then-wife, journalist Maria Shriver, were vacationing in Hawaii, they took to the water for a nice, relaxing swim. Arnold noticed another man in distress about 100 yards out from shore. The man was clutching a boogie board, but obviously in need of help.
Schwarzenegger swam out to the man who was suffering from severe cramps and told him to hold on to the board. Then, he towed the man back to safety.
Can you imagine being stuck out there and having the Terminator save you? What a story.