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".
About 7% of all humans who have ever lived are alive today.
War pigs were used in ancient warfare to counter against war elephants, which feared the pigs (and their squeals) and would bolt. War pigs were sometimes lit on fire to enhance this effect.