Chad is chad which is why he monkey. He fought in the great monkey war. Between the Orangutans, and the Gorillas. It was a war where murder.
As said from PatatoSald the great monkey:
“In the great monki war, one of the monkis got injured. But chad saved him when he was in his prime age, he carried for the Gorillas and killed the Orangutans forcing the Orangutans to surrender.”
Chad later died of obesity
"For every great Monki there are chads and for great chad there are bad monki's but every monki has a good in it so never judge a monki by its first impression." -Zipez A great monki chad