Book excerpt: Snow day! School’s closed! And somewhere out there, a snowball fight is waiting to happen! Comedian and future Tonight Show host Jimmy Fallon brings the high action and high comedy of winter’s most riotous kid rite of passage to life in brisk, uproarious verse. Snow bunnies and Fallon fans of all ages will recognize the runny noses, snowball assaults, toboggan shields, and hand-me-down snowsuits that are essential ingredients of cold-weather fun.