Just when we were thinking of how delightful it was that electric cars were so nice and quiet, Audi adds sound effects to its R8 e-tron electro-beast concept car, saving absent-minded pedestrians from an unfortunate encounter with this battery-powered road rocket.

Audi's not the first manufacturer to cover its legal posterior with sound effects in its electric vehicles, and it certainly won't be the last. Well, at least Audi's interpretation sounds like a futuristic gas guzzler, rather than a tree full of chirping birds.

Take a look at (and a listen to) Audi's interpretation of what an electric car should sound like, and let us know in the comments if you think this is entirely necessary.