Because thwacking Toyota is like, the totally cool thing to do, Japan wants the company to investigate whether or not the brakes on the 2010 Toyota Prius are malfunctioning after 14 separate incidents in the last two months.
Despite everything going on with Toyota, and all the apparent reticence on their part to address safety issues, it's important to recognize investigations happen all the time. Still, it's not going to be a good day for the company as The Daily Show just launched their new feature: Toyotathon Of Death!
The 2010 Prius isn't under the current recall, so there's probably no risk of accelerating out of control and then having your brakes fail. At least we hope not...