Wyatt Haas loves unicorns and rainbows. The Montana 5-year-old is also battling brain cancer. So before he flew across the country with his mom to undergo treatment at St. Jude's Children's Research Hospital, his class had a magical surprise. His classmate's mom, Jennifer Nielsen, decorated up her horse using animal-safe chalk, and Wyatt saddled up. Corissa Haas told InsideEdition.com that Wyatt asked her afterward, "Mom, I want to go to the unicorn store to get my own rainbow unicorn to ride."