Prius gets optional underhood, zombie-deterring noisemaker, sounds appropriately futuristic (video)

Electric vehicles and hybrids are here to save the environment (or at least kill your fuel bill), but if you listen to some people they're also here to mow down our pedestrians thanks to their ninja-like ways. Nissan's Leaf has already gone the way of sci-fi by offering a Blade Runner-inspired exterior soundtrackto make sidewalk replicants take notice, and now the Prius is joining in on the fun