Classic Gaming Moment #1, Courtesy of Halo 2, is the Master Chief assassinating the Prophet of Regret by punching him to death. Fists of Win.
Which segues nicely into Classic Gaming moment #2, Needler Rain. This one is brought to us by SSOHpkc from Youtube. In addition to making good gaming videos, he is funny as hell. Do yourself a favor, watch his videos for a game you are interested in. It will give you a whole new perspective.