i actually heard this on oprah a long time ago, but thought about it today.
it's very rare... but it is possible that if you're filling up your car at the gas station and if you, or someone is sliding on the seats and causing static electricity that it could cause an explosion.... it is hard to happen, but it's possible that around gas flames even the smallest spark (even just static electricity) can ignite. this has happened a few times before, so just be aware.
i thought about this today cause i was about to start filling up my car at the gas station and i had my dog in the car, and i noticed her hair (she has longish hair) was sticking up from static electricity . so ofcourse i brought her out of the car with me while i was filling up.