The fifth and sixth Primate Behavior viral videos for Rise of the Planet of the Apes have been discovered. One is a scene taken from an old documentary, which shows how Chimpanzees in Idi Amin's army learned how to use machetes to stave off attacks. It reportedly comes from director Rupert Wyatt's own private stash of videotapes, which he used for inspiration in making this upcoming summer reboot. The second video was made by the studio as a goof on this weekend's Carmageddon, which will see the 405 in Southern California shut down for the entire weekend. Check out the madness below.

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