Ne Ne Ne Ne...

Ne Ne Ne Ne... is a challenge added in the Fallout: New Vegas add-on Gun Runners' Arsenal.

Obtaining
To complete this challenge, you must cripple five right arms with any form of shotgun except the Sturdy caravan shotgun; any ammo can be used but slugs (Confirmed, Xbox 360).

Behind the scenes
This is a reference to the film RoboCop, in which Alex Murphy was dismembered by a shotgun while Clarence Boddicker uttered a beeping noise (which sounded like 'ne ne ne ne') beforehand.