Two fandoms, both alike in dignity (and nitpicking.) In fair Alternate Reality, where we lay our scene. Imagine if Darth Vader stumbled through a temporal anomaly and landed in the Alpha Quadrant.
Put aside for a moment that the Empire doesn't have shields and Starfleet would tear through them like tissue paper. Put aside that Sith Lords would laugh in the face of the Vulcan Nerve Pinch and force throw Spock like a rag doll. Just bask in the glorious absurdity of a fan trailer that dares to ask, “What if the 'Star Wars' and 'Star Trek' universes collided?”
And then quake in fear because with JJ Abrams, anything is possible.