If you really need a reason, here's one I used. Escaped circus elephant
On August 20, 1994, during a performance at the Neal Blaisdell Center, she killed her trainer, Allen Campbell, and seriously injured her groomer, Dallas Beckwith. Tyke then bolted from the arena and ran through the streets of the Kakaakocentral business district for more than thirty minutes. Unable to calm the elephant, local police eventually opened fire on the animal, which eventually collapsed from the wounds and died.
You know, if you really need a reason,
KC