As the DC red line train I rode last week shot through a tunnel, a happy brown bunny jumped up and down on the walls, lofting up a bottle of Nestle Quik. It wasn’t a video, it was a series of back-illuminated panels, each one a successive frame in the animated cartoon. It was like running through flipbook in real life. I found a clip of it on YouTube, posted inside, the cartoon starts at 15 seconds in.