The 442nd Infantry Regiment, a largely Japanese American unit that served during WWII, did so while their families were held in internment camps. Their motto was "Go for Broke" and they were the most decorated unit in U.S. military history.
Following the release of Rocky IV, a joke was making rounds in Hollywood. Since Rocky had run out of opponents, he would have to fight an alien if a fifth movie was made. Jim and John Thomas took the joke seriously and wrote a screenplay based on it, which later became the movie "Predator".
Jellyfish can sting even when they're dead.
Researchers have found that swearing when in pain may release pain-killing endorphins.