Theory of Limited Capacitance

Big title meaning, the more you know, the more you forget. Your brain can only hold so much information. To learn new info, you must forget something else. So, why is it that instead of forgetting the words to old songs, I forget things that might actually come in handy down the road....It would be okay if I was ever on a useless trivia show or ever asked the lyrics to old 80's rap songs, otherwise I should start forgetting this useless info.