Sorry for jumping in here so late. It is a build-up of static electricity caused by the wheels rolling along the road, look up a Van De Graaf generator in a search engine. Your main problem though is your footwear. If you have conductive shoes, when you step out of the car, you are providing a route for the charge to run to earth, which cannot go through the insulating tyres. Some shoes do it and others don't, I can't be more specific than that. I have stopped wearing some shoes I have owned because I was getting fried everytime I stepped out of my car and I started to feel stupid closing the door with my elbow!
You could get some of those black strips that you see on some cars that attach to the car body behind the car bumper and trail along the road, so earthing the car at all times.
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