Tesla introduced Autopilot features to the Model S for the sake of convenience, but some drivers have been using it as a chance to goof off. They've invoked the semi-autonomous mode while speeding, or even while they're sitting in the back seat. Understandably, Tesla isn't happy with these stunts -- and it's getting ready to clamp down. The company's Elon Musk has revealed that Autopilot will get "additional constraints" so that owners can't abuse it. There's no mention of what those features will entail or when you'll see them, but it'd be reasonable to expect speed limits and occupancy checks.