As part of Steve Nash's "Nash, Camera, Action", a movie parody series directed by Nash himself, he decided to take on Star Wars.
Makes sense seeing as how he has pretty much converted to the dark side and now plays for the Suns' rival, the Los Angeles Lakers.
Nash plays Darth Vader in the clip with Suns forward Jared Dudley as a Luke Skywalker-esque character trying to stop Nash from going to the dark side.
Its hard not to like Steve Nash after seeing a clip like this. He really is a pretty funny guy and hopefully gets a job on television after his career is done.