Personalized Whatif I Love to Swim with Whatif Monster Youth T-Shirt. Take a dip with the Whatif Monster! Whatif I Love to Swim with Whatif Monster Youth T-Shirt - Kelly Green, from the hit children's book, "Jonathan James and the Whatif Monster" 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.