Crazy Car Optical Illusion

Jim Gansle from Canyon Lake, Texas sent me this photo of a vintage car (along with few more visitors that submit illusions regularly). Seems that the photo really went viral, since lately I stumble upon it very often across the web. Enough on the background of this flick, now let me describe the effect. Once you see this photo, you'll probably need some time before you spot something very strange in it. I was wondering what is so interesting about this car, but after it hit me (no, not the car, luckily the car didn't hit me), it all became clear. This is what Jim wrote: "In case you haven't seen this before. I really enjoy your site - got the widget to tell me when a new one is available. What a fun you would have at intersections. You figure it out. I got a headache". This will be added to our Transportation category, the one I speak so rarely about.