The reason the RSA videos are so fregin awesome is because the knowledge they present are starkly non-trivial. As children we develop layer after layer of analysis of knowledge of others, and indeed, looking at social problems using decentralized perspectives is one of the hallmarks of adult thinking.
Although it is a mainstay of our communication, much of it is done subconsciously, and this video actually serves to formalize the games that we intuitively play.