In the days before secondary brake lights were mandatory, Winky The White Cat was the thing to get to indicated to cars behind you that if they don't slow down, they'd get really intimate with the back of your vehicle. Unfortunately, Winky went out of sale nearly two decades ago.
So what did Jalopnik do? They built their own. Named Wanky, this cat was made from part of various junkers, wires, and a poor orphaned stuffed cat.
The result? A cat that scares the living bejeezus out of kids in the car behind you.