Personalized Don't You Have More Important Things To Do black Youth T-Shirt. Don't You Have More Important Things To Do black Youth T-Shirt - White, featuring George, the sassy penguin from "Bob is a Unicorn" by Michelle Nelson-Schmidt. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.