Though they never played a minute or called a single play, Jason Seely and Cash Sirois, with help from Cash's brother Mike, are responsible for some of the most memorable moments of the Dallas Mavericks' 2011 championship run. The two put together a video featuring encouragement from Dallas sports legends including Roger Staubach, Tony Dorsett, Troy Aikman and Nolan Ryan that gave goosebumps to everyone in the American Airlines Center — save perhaps a few Miami Heat players. They're just as good at getting a laugh too, which would explain how so many of their in-game videos end up going viral on YouTube, like the "What Do the Mavs Say?" parody, the Geico commercial parody "Guess What Day It Is?" and "José Can You Say?" in which point guard José Calderon teaches fellow Mavs some Spanish phrases likely to get them thrown out of a game or slapped. That they can get superstars to go along with the goofiness is a testament to their talents. And now that they're working with the Dallas Cowboys, there will be at least one entertaining thing for fans to watch at JerryWorld this season.