Lip-synching YouTube legend, Keenan Cahill, has quickly wracked up over 66 million views on YouTube, appeared as a guest on Chelsea Lately, and performed a YouTube duo with 50 Cent. Cahill's viral success began with his release of Katy Perry's "Teenage Dream," which has received 19 million plus views and can be found below. Cahill has a rare genetic disorder called Maroteaux Lamy Syndrome, which in some cases, including Cahill's, results in individuals developing a dwarf-like appearance. It's curious why his videos have gained such popularity, but regardless of his audience's interest, the 16-year-old is reveling in his new found fame and has become known for his videos at his high school and throughout the world.