You don't stop laughing because you grow old. You grow old because you stop laughing.

Mike Dirnt (born Michael Ryan Pritchard (sometimes known as Mr. Kidner) on May 4, 1972) is an American musician who is currently the bassist and backing vocalist for the American rock band Green Day. While at school, he would play "air-bass." While pretending to pluck the strings, he made the noise, "dirnt, dirnt, dirnt," so his schoolmates started to call him "Mike Dirnt."