Why Are You So Mean to Me? is a 1986 Sesame Street storybook featuring Grover, Betty Lou, Big Bird, and Oscar the Grouch. Grover's Mommy gives him a new baseball bat on the day of the school picnic at Bluebird Park. Grover has fun playing with Betty Lou and the other students at the park, but when it's time to pick teams for baseball, nobody wants to pick Grover. They know that he never played it before.