Taking 3D billboards to a new extreme, the slingshot seems to dwarf the billboard itself, effectively conveying the force that will propel you forward in a collision. The one thing the ad doesn't replicate, however, is the variety of surfaces you'll impact after launch. Seatbacks might not seem particularly harmful, but anything you strike will be painful as you fly into, over or around them at those velocities. We're not quite sure where this billboard is located or who was responsible for it, but we like it a lot. Buckle up. Even in the back seat.