Proper beer pong cups should be the smaller translucent Solo cups. They offer a smaller target and a better view of the carnage with violent dunks or pass-though cup splits. (My co-ed house had a very dynamic set of rules for Beer Pong. Ultra-low net, super fast serves, twitch reflexes, hyper environmental play, thrown paddles. You haven't played real Beer Pong until you've played our house rules from the late 80's.)