Plot: Two high school freshmen pitch a tasty way to improve the ice cream cone; an entrepreneur presents a reinvented kid stroller with an athletic twist; a woman hopes to make the lives of parents easier with her line of child products; and a magician duo performs a music-magic entertainment spectacle, but will the Sharks see through the illusion? Also, an update on Gameday Couture, the fashionable women's gameday apparel, which Mark Cuban invested in during Season 6.