Click to expand Tap to zoom I Am Invited to a Party!: Elephant and Piggie Series Hardcover Book Save Liquid error (snippets/product-badge line 32): Computation results in '-Infinity'% $9.99 | / 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart I Am Invited to a Party!: Elephant and Piggie Series Hardcover Book Gerald is careful. Piggie is not.Piggie cannot help smiling. Gerald can.Gerald worries so that Piggie does not have to.Gerald and Piggie are best friends.In My Friend is Sad, Gerald is sad. How can Piggie be happy if Gerald is sad?