Party Favor has a problem.
Despite coming from a family of mages and magicians, he has difficulty using magic. Scratch that, his horn doesn't even work. In fact, for all the nothing that his horn does, he might as well be an earth pony. And that easily makes him the laughingstock of the other unicorns, including his brother.
But perhaps his talents lie not with magic, but with something else entirely.
Inspired by a random observation while watching "The Cutie Map".